termux-packages/build-package.sh

#!/bin/bash
# shellcheck disable=SC1117

set -e -o pipefail -u

# Utility function to log an error message and exit with an error code.
source scripts/build/termux_error_exit.sh

# Utility function to download a resource with an expected checksum.
source scripts/build/termux_download.sh

# Utility function for golang-using packages to setup a go toolchain.
source scripts/build/setup/termux_setup_golang.sh

# Utility function for rust-using packages to setup a rust toolchain.
source scripts/build/setup/termux_setup_rust.sh

# Utility function to setup a current ninja build system.
source scripts/build/setup/termux_setup_ninja.sh

# Utility function to setup a current meson build system.
source scripts/build/setup/termux_setup_meson.sh

# Utility function to setup a current cmake build system
source scripts/build/setup/termux_setup_cmake.sh

# First step is to handle command-line arguments. Not to be overridden by packages.
source scripts/build/termux_step_handle_arguments.sh

# Setup variables used by the build. Not to be overridden by packages.
source scripts/build/termux_step_setup_variables.sh

# Save away and restore build setups which may change between builds.
source scripts/build/termux_step_handle_buildarch.sh

# Function to get TERMUX_PKG_VERSION from build.sh
source scripts/build/termux_extract_dep_info.sh

termux_download_deb() {
	local package=$1
	local package_arch=$2
	local version=$3
	local deb_file=${package}_${version}_${package_arch}.deb
	for idx in $(seq ${#TERMUX_REPO_URL[@]}); do
		local TERMUX_REPO_NAME=$(echo ${TERMUX_REPO_URL[$idx-1]} | sed -e 's%https://%%g' -e 's%http://%%g' -e 's%/%-%g')
		local PACKAGE_FILE_PATH="${TERMUX_REPO_NAME}-${TERMUX_REPO_DISTRIBUTION[$idx-1]}-${TERMUX_REPO_COMPONENT[$idx-1]}-Packages"
		read -d "\n" PKG_PATH PKG_HASH <<<$(./scripts/get_hash_from_file.py "${TERMUX_COMMON_CACHEDIR}-$arch/$PACKAGE_FILE_PATH" $package $version)
		if ! [ "$PKG_HASH" = "" ]; then
			if [ ! "$TERMUX_QUIET_BUILD" = true ]; then
				echo "Found $package in ${TERMUX_REPO_URL[$idx-1]}/dists/${TERMUX_REPO_DISTRIBUTION[$idx-1]}"
			fi
			break
		fi
	done
	if [ "$PKG_HASH" = "" ]; then
		return 1
	else
		termux_download ${TERMUX_REPO_URL[$idx-1]}/${PKG_PATH} \
				$TERMUX_COMMON_CACHEDIR-$package_arch/${deb_file} \
				$PKG_HASH
		return 0
	fi
}

# Script to download InRelease, verify it's signature and then download Packages.xz by hash
termux_step_get_repo_files() {
	# Ensure folders present (but not $TERMUX_PKG_SRCDIR, it will be created in build)
	mkdir -p "$TERMUX_COMMON_CACHEDIR" \
		 "$TERMUX_COMMON_CACHEDIR-$TERMUX_ARCH" \
		 "$TERMUX_COMMON_CACHEDIR-all" \
		 "$TERMUX_DEBDIR" \
		 "$TERMUX_PKG_BUILDDIR" \
		 "$TERMUX_PKG_PACKAGEDIR" \
		 "$TERMUX_PKG_TMPDIR" \
		 "$TERMUX_PKG_CACHEDIR" \
		 "$TERMUX_PKG_MASSAGEDIR" \
		 $TERMUX_PREFIX/{bin,etc,lib,libexec,share,tmp,include}
	if [ "$TERMUX_INSTALL_DEPS" = true ]; then
		if [ "$TERMUX_NO_CLEAN" = false ]; then
			# Remove all previously extracted/built files from $TERMUX_PREFIX:
			rm -rf $TERMUX_PREFIX
			rm -f /data/data/.built-packages/*
			# Setup bootstrap
			if [ $TERMUX_ARCH == aarch64 ]; then
				local bootstrap_sha256=2944ad699814329007d1f9c056e7c8323243c8b4a257cbd05904216f89fc3746
			elif [ $TERMUX_ARCH == i686 ]; then
				local bootstrap_sha256=8f4dee0b1e161689b60f330ac0cc813b56ab479f2cd789eb8459165a3be13bdb
			elif [ $TERMUX_ARCH == arm ]; then
				local bootstrap_sha256=f471c0af326677d87ca4926d54860d10d751dd4f8d615d5b1de902841601b41e
			elif [ $TERMUX_ARCH == x86_64 ]; then
				local bootstrap_sha256=93384f0343c13f604dbacd069276291bd7042fc6d42c6d7514c7e573d968c614
			fi
			termux_download https://termux.net/bootstrap/bootstrap-${TERMUX_ARCH}.zip \
					${TERMUX_COMMON_CACHEDIR}/bootstrap-${TERMUX_ARCH}.zip \
					$bootstrap_sha256
			unzip -qo ${TERMUX_COMMON_CACHEDIR}/bootstrap-${TERMUX_ARCH}.zip -d $TERMUX_PREFIX
			(
				cd $TERMUX_PREFIX
				while read link; do
					ln -sf ${link/←/ }
				done<SYMLINKS.txt
				rm SYMLINKS.txt
			)
		fi
		# Import signing keys from files
		gpg --import ${TERMUX_REPO_SIGNING_KEYS}

		for idx in $(seq ${#TERMUX_REPO_URL[@]}); do
			local TERMUX_REPO_NAME=$(echo ${TERMUX_REPO_URL[$idx-1]} | sed -e 's%https://%%g' -e 's%http://%%g' -e 's%/%-%g')
			curl --fail -L "${TERMUX_REPO_URL[$idx-1]}/dists/${TERMUX_REPO_DISTRIBUTION[$idx-1]}/InRelease" \
			    -o ${TERMUX_COMMON_CACHEDIR}/${TERMUX_REPO_NAME}-${TERMUX_REPO_DISTRIBUTION[$idx-1]}-InRelease \
			    || curl --fail -L "${TERMUX_REPO_URL[$idx-1]}/dists/${TERMUX_REPO_DISTRIBUTION[$idx-1]}/Release.gpg" \
				    -o ${TERMUX_COMMON_CACHEDIR}/${TERMUX_REPO_NAME}-${TERMUX_REPO_DISTRIBUTION[$idx-1]}-Release.gpg \
			    && curl --fail -L "${TERMUX_REPO_URL[$idx-1]}/dists/${TERMUX_REPO_DISTRIBUTION[$idx-1]}/Release" \
				    -o ${TERMUX_COMMON_CACHEDIR}/${TERMUX_REPO_NAME}-${TERMUX_REPO_DISTRIBUTION[$idx-1]}-Release \
			    || termux_error_exit "Download of InRelease and Release.gpg from ${TERMUX_REPO_URL[$idx-1]}/dists/${TERMUX_REPO_DISTRIBUTION[$idx-1]} failed"

			if [ -f ${TERMUX_COMMON_CACHEDIR}/${TERMUX_REPO_NAME}-${TERMUX_REPO_DISTRIBUTION[$idx-1]}-InRelease ]; then
				local RELEASE_FILE=${TERMUX_COMMON_CACHEDIR}/${TERMUX_REPO_NAME}-${TERMUX_REPO_DISTRIBUTION[$idx-1]}-InRelease
				gpg --verify $RELEASE_FILE
			else
				local RELEASE_FILE=${TERMUX_COMMON_CACHEDIR}/${TERMUX_REPO_NAME}-${TERMUX_REPO_DISTRIBUTION[$idx-1]}-Release
				gpg --verify ${RELEASE_FILE}.gpg $RELEASE_FILE
			fi

			for arch in all $TERMUX_ARCH; do
				local packages_hash=$(./scripts/get_hash_from_file.py ${RELEASE_FILE} $arch ${TERMUX_REPO_COMPONENT[$idx-1]})
				# If packages_hash = "" then the repo probably doesn't contain debs for $arch
				if ! [ "$packages_hash" = "" ]; then
					termux_download "${TERMUX_REPO_URL[$idx-1]}/dists/${TERMUX_REPO_DISTRIBUTION[$idx-1]}/${TERMUX_REPO_COMPONENT[$idx-1]}/binary-$arch/Packages" \
							"${TERMUX_COMMON_CACHEDIR}-$arch/${TERMUX_REPO_NAME}-${TERMUX_REPO_DISTRIBUTION[$idx-1]}-${TERMUX_REPO_COMPONENT[$idx-1]}-Packages" \
							$packages_hash
				fi
			done
		done
	fi
}

# Source the package build script and start building. No to be overridden by packages.
termux_step_start_build() {
	# shellcheck source=/dev/null
	source "$TERMUX_PKG_BUILDER_SCRIPT"

	TERMUX_STANDALONE_TOOLCHAIN="$TERMUX_COMMON_CACHEDIR/${TERMUX_NDK_VERSION}-${TERMUX_ARCH}-${TERMUX_PKG_API_LEVEL}"
	# Bump the below version if a change is made in toolchain setup to ensure
	# that everyone gets an updated toolchain:
	TERMUX_STANDALONE_TOOLCHAIN+="-v1"

	if [ -n "${TERMUX_PKG_BLACKLISTED_ARCHES:=""}" ] && [ "$TERMUX_PKG_BLACKLISTED_ARCHES" != "${TERMUX_PKG_BLACKLISTED_ARCHES/$TERMUX_ARCH/}" ]; then
		echo "Skipping building $TERMUX_PKG_NAME for arch $TERMUX_ARCH"
		exit 0
	fi

	if [ "$TERMUX_SKIP_DEPCHECK" = false ] && [ "$TERMUX_INSTALL_DEPS" = true ]; then
		# Download dependencies
		local PKG DEP_ARCH DEP_VERSION DEB_FILE _PKG_DEPENDS _PKG_BUILD_DEPENDS _SUBPKG_DEPENDS=""
		# remove (>= 1.0) and similar version tags:
		_PKG_DEPENDS=$(echo ${TERMUX_PKG_DEPENDS// /} | sed "s/[(][^)]*[)]//g")
		_PKG_BUILD_DEPENDS=${TERMUX_PKG_BUILD_DEPENDS// /}
		# Also download subpackages dependencies (except the mother package):
		for SUBPKG in packages/$TERMUX_PKG_NAME/*.subpackage.sh; do
			test -e $SUBPKG || continue
			_SUBPKG_DEPENDS+=" $(. $SUBPKG; echo $TERMUX_SUBPKG_DEPENDS | sed s%$TERMUX_PKG_NAME%%g)"
		done
		for PKG in $(echo ${_PKG_DEPENDS//,/ } ${_SUBPKG_DEPENDS//,/ } ${_PKG_BUILD_DEPENDS//,/ } | tr ' ' '\n' | sort -u); do
			# handle "or" in dependencies (use first one):
			if [ ! "$PKG" = "${PKG/|/}" ]; then PKG=$(echo "$PKG" | sed "s%|.*%%"); fi
			# llvm doesn't build if ndk-sysroot is installed:
			if [ "$PKG" = "ndk-sysroot" ]; then continue; fi
			read DEP_ARCH DEP_VERSION <<< $(termux_extract_dep_info "$PKG")

			if [ ! "$TERMUX_QUIET_BUILD" = true ]; then
				echo "Downloading dependency $PKG@$DEP_VERSION if necessary..."
			fi
			if ! termux_download_deb $PKG $DEP_ARCH $DEP_VERSION; then
				echo "Download of $PKG@$DEP_VERSION from $TERMUX_REPO_URL failed, building instead"
				./build-package.sh -a $TERMUX_ARCH -I "$PKG"
				continue
			else
				if [ ! "$TERMUX_QUIET_BUILD" = true ]; then echo "extracting $PKG..."; fi
				(
					cd $TERMUX_COMMON_CACHEDIR-$DEP_ARCH
					ar x ${PKG}_${DEP_VERSION}_${DEP_ARCH}.deb data.tar.xz
					tar -xf data.tar.xz --no-overwrite-dir -C /
				)
			fi

			if termux_download_deb $PKG-dev $DEP_ARCH $DEP_VERSION; then
				(
					cd $TERMUX_COMMON_CACHEDIR-$DEP_ARCH
					ar x $PKG-dev_${DEP_VERSION}_${DEP_ARCH}.deb data.tar.xz
					tar xf data.tar.xz --no-overwrite-dir -C /
				)
			else
				echo "Download of $PKG-dev@$DEP_VERSION from $TERMUX_REPO_URL failed"
			fi
			mkdir -p /data/data/.built-packages
			echo "$DEP_VERSION" > "/data/data/.built-packages/$PKG"
		done
	elif [ "$TERMUX_SKIP_DEPCHECK" = false ] && [ "$TERMUX_INSTALL_DEPS" = false ]; then
		# Build dependencies
		for PKG in $(./scripts/buildorder.py "$TERMUX_PKG_BUILDER_DIR"); do
			echo "Building dependency $PKG if necessary..."
			# Built dependencies are put in the default TERMUX_DEBDIR instead of the specified one
			./build-package.sh -a $TERMUX_ARCH -s "$PKG"
		done
	fi

	TERMUX_PKG_FULLVERSION=$TERMUX_PKG_VERSION
	if [ "$TERMUX_PKG_REVISION" != "0" ] || [ "$TERMUX_PKG_FULLVERSION" != "${TERMUX_PKG_FULLVERSION/-/}" ]; then
		# "0" is the default revision, so only include it if the upstream versions contains "-" itself
		TERMUX_PKG_FULLVERSION+="-$TERMUX_PKG_REVISION"
	fi

	if [ "$TERMUX_DEBUG" = true ]; then
		if [ "$TERMUX_PKG_HAS_DEBUG" == "yes" ]; then
			DEBUG="-dbg"
		else
			echo "Skipping building debug build for $TERMUX_PKG_NAME"
			exit 0
		fi
	else
		DEBUG=""
	fi

	if [ -z "$TERMUX_DEBUG" ] &&
	   [ -z "${TERMUX_FORCE_BUILD+x}" ] &&
	   [ -e "/data/data/.built-packages/$TERMUX_PKG_NAME" ]; then
		if [ "$(cat "/data/data/.built-packages/$TERMUX_PKG_NAME")" = "$TERMUX_PKG_FULLVERSION" ]; then
			echo "$TERMUX_PKG_NAME@$TERMUX_PKG_FULLVERSION built - skipping (rm /data/data/.built-packages/$TERMUX_PKG_NAME to force rebuild)"
			exit 0
		fi
	fi

	# Cleanup old state:
	rm -Rf "$TERMUX_PKG_BUILDDIR" \
		"$TERMUX_PKG_PACKAGEDIR" \
		"$TERMUX_PKG_SRCDIR" \
		"$TERMUX_PKG_TMPDIR" \
		"$TERMUX_PKG_MASSAGEDIR"

	# Ensure folders present (but not $TERMUX_PKG_SRCDIR, it will be created in build)
	mkdir -p "$TERMUX_COMMON_CACHEDIR" \
		 "$TERMUX_DEBDIR" \
		 "$TERMUX_PKG_BUILDDIR" \
		 "$TERMUX_PKG_PACKAGEDIR" \
		 "$TERMUX_PKG_TMPDIR" \
		 "$TERMUX_PKG_CACHEDIR" \
		 "$TERMUX_PKG_MASSAGEDIR" \
		 $TERMUX_PREFIX/{bin,etc,lib,libexec,share,tmp,include}

	# Make $TERMUX_PREFIX/bin/sh executable on the builder, so that build
	# scripts can assume that it works on both builder and host later on:
	ln -f -s /bin/sh "$TERMUX_PREFIX/bin/sh"

	local TERMUX_ELF_CLEANER_SRC=$TERMUX_COMMON_CACHEDIR/termux-elf-cleaner.cpp
	local TERMUX_ELF_CLEANER_VERSION
	TERMUX_ELF_CLEANER_VERSION=$(bash -c ". $TERMUX_SCRIPTDIR/packages/termux-elf-cleaner/build.sh; echo \$TERMUX_PKG_VERSION")
	termux_download \
		"https://raw.githubusercontent.com/termux/termux-elf-cleaner/v$TERMUX_ELF_CLEANER_VERSION/termux-elf-cleaner.cpp" \
		"$TERMUX_ELF_CLEANER_SRC" \
		690991371101cd1dadf73f07f73d1db72fe1cd646dcccf11cd252e194bd5de76
	if [ "$TERMUX_ELF_CLEANER_SRC" -nt "$TERMUX_ELF_CLEANER" ]; then
		g++ -std=c++11 -Wall -Wextra -pedantic -Os -D__ANDROID_API__=$TERMUX_PKG_API_LEVEL \
			"$TERMUX_ELF_CLEANER_SRC" -o "$TERMUX_ELF_CLEANER"
	fi

	if [ -n "$TERMUX_PKG_BUILD_IN_SRC" ]; then
		echo "Building in src due to TERMUX_PKG_BUILD_IN_SRC being set" > "$TERMUX_PKG_BUILDDIR/BUILDING_IN_SRC.txt"
		TERMUX_PKG_BUILDDIR=$TERMUX_PKG_SRCDIR
	fi

	echo "termux - building $TERMUX_PKG_NAME for arch $TERMUX_ARCH..."
	test -t 1 && printf "\033]0;%s...\007" "$TERMUX_PKG_NAME"

	# Avoid exporting PKG_CONFIG_LIBDIR until after termux_step_host_build.
	export TERMUX_PKG_CONFIG_LIBDIR=$TERMUX_PREFIX/lib/pkgconfig
	# Add a pkg-config file for the system zlib.
	mkdir -p "$TERMUX_PKG_CONFIG_LIBDIR"
	cat > "$TERMUX_PKG_CONFIG_LIBDIR/zlib.pc" <<-HERE
		Name: zlib
		Description: zlib compression library
		Version: 1.2.8
		Requires:
		Libs: -lz
	HERE
	ln -sf $TERMUX_STANDALONE_TOOLCHAIN/sysroot/usr/lib/$TERMUX_HOST_PLATFORM/$TERMUX_PKG_API_LEVEL/libz.so $TERMUX_PREFIX/lib/libz.so
	# Keep track of when build started so we can see what files have been created.
	# We start by sleeping so that any generated files above (such as zlib.pc) get
	# an older timestamp than the TERMUX_BUILD_TS_FILE.
	sleep 1
	TERMUX_BUILD_TS_FILE=$TERMUX_PKG_TMPDIR/timestamp_$TERMUX_PKG_NAME
	touch "$TERMUX_BUILD_TS_FILE"
}

# Run just after sourcing $TERMUX_PKG_BUILDER_SCRIPT. May be overridden by packages.
termux_step_extract_package() {
	if [ -z "${TERMUX_PKG_SRCURL:=""}" ] || [ -n "${TERMUX_PKG_SKIP_SRC_EXTRACT:=""}" ]; then
		mkdir -p "$TERMUX_PKG_SRCDIR"
		return
	fi
	cd "$TERMUX_PKG_TMPDIR"
	local PKG_SRCURL=(${TERMUX_PKG_SRCURL[@]})
	local PKG_SHA256=(${TERMUX_PKG_SHA256[@]})
	if  [ ! ${#PKG_SRCURL[@]} == ${#PKG_SHA256[@]} ] && [ ! ${#PKG_SHA256[@]} == 0 ]; then
		termux_error_exit "Error: length of TERMUX_PKG_SRCURL isn't equal to length of TERMUX_PKG_SHA256."
	fi
	# STRIP=1 extracts archives straight into TERMUX_PKG_SRCDIR while STRIP=0 puts them in subfolders. zip has same behaviour per default
	# If this isn't desired then this can be fixed in termux_step_post_extract_package.
	local STRIP=1
	for i in $(seq 0 $(( ${#PKG_SRCURL[@]}-1 ))); do
		test "$i" -gt 0 && STRIP=0
		local filename
		filename=$(basename "${PKG_SRCURL[$i]}")
		local file="$TERMUX_PKG_CACHEDIR/$filename"
		# Allow TERMUX_PKG_SHA256 to be empty:
		set +u
		termux_download "${PKG_SRCURL[$i]}" "$file" "${PKG_SHA256[$i]}"
		set -u

		local folder
		set +o pipefail
		if [ "${file##*.}" = zip ]; then
			folder=$(unzip -qql "$file" | head -n1 | tr -s ' ' | cut -d' ' -f5-)
			rm -Rf $folder
			unzip -q "$file"
			mv $folder "$TERMUX_PKG_SRCDIR"
		else
			mkdir -p "$TERMUX_PKG_SRCDIR"
			tar xf "$file" -C "$TERMUX_PKG_SRCDIR" --strip-components=$STRIP
		fi
		set -o pipefail
	done
}

# Hook for packages to act just after the package has been extracted.
# Invoked in $TERMUX_PKG_SRCDIR.
termux_step_post_extract_package() {
	return
}

# Optional host build. Not to be overridden by packages.
source scripts/build/termux_step_handle_hostbuild.sh

# Perform a host build. Will be called in $TERMUX_PKG_HOSTBUILD_DIR.
# After termux_step_post_extract_package() and before termux_step_patch_package()
source scripts/build/termux_step_host_build.sh

# Setup a standalone Android NDK toolchain. Not to be overridden by packages.
termux_step_setup_toolchain() {
	# We put this after system PATH to avoid picking up toolchain stripped python
	export PATH=$PATH:$TERMUX_STANDALONE_TOOLCHAIN/bin

	export CFLAGS=""
	export LDFLAGS="-L${TERMUX_PREFIX}/lib"

	export AS=${TERMUX_HOST_PLATFORM}-clang
	export CC=$TERMUX_HOST_PLATFORM-clang
	export CXX=$TERMUX_HOST_PLATFORM-clang++

	export CCTERMUX_HOST_PLATFORM=$TERMUX_HOST_PLATFORM$TERMUX_PKG_API_LEVEL
	if [ $TERMUX_ARCH = arm ]; then
	       CCTERMUX_HOST_PLATFORM=armv7a-linux-androideabi$TERMUX_PKG_API_LEVEL
	fi
	export AR=$TERMUX_HOST_PLATFORM-ar
	export CPP=${TERMUX_HOST_PLATFORM}-cpp
	export CC_FOR_BUILD=gcc
	export LD=$TERMUX_HOST_PLATFORM-ld
	export OBJDUMP=$TERMUX_HOST_PLATFORM-objdump
	# Setup pkg-config for cross-compiling:
	export PKG_CONFIG=$TERMUX_STANDALONE_TOOLCHAIN/bin/${TERMUX_HOST_PLATFORM}-pkg-config
	export RANLIB=$TERMUX_HOST_PLATFORM-ranlib
	export READELF=$TERMUX_HOST_PLATFORM-readelf
	export STRIP=$TERMUX_HOST_PLATFORM-strip

	# Android 7 started to support DT_RUNPATH (but not DT_RPATH), so we may want
	# LDFLAGS+="-Wl,-rpath=$TERMUX_PREFIX/lib -Wl,--enable-new-dtags"
	# and no longer remove DT_RUNPATH in termux-elf-cleaner.

	if [ "$TERMUX_ARCH" = "arm" ]; then
		# https://developer.android.com/ndk/guides/standalone_toolchain.html#abi_compatibility:
		# "We recommend using the -mthumb compiler flag to force the generation of 16-bit Thumb-2 instructions".
		# With r13 of the ndk ruby 2.4.0 segfaults when built on arm with clang without -mthumb.
		CFLAGS+=" -march=armv7-a -mfpu=neon -mfloat-abi=softfp -mthumb"
		LDFLAGS+=" -march=armv7-a"
	elif [ "$TERMUX_ARCH" = "i686" ]; then
		# From $NDK/docs/CPU-ARCH-ABIS.html:
		CFLAGS+=" -march=i686 -msse3 -mstackrealign -mfpmath=sse"
	elif [ "$TERMUX_ARCH" = "aarch64" ]; then
		:
	elif [ "$TERMUX_ARCH" = "x86_64" ]; then
		:
	else
		termux_error_exit "Invalid arch '$TERMUX_ARCH' - support arches are 'arm', 'i686', 'aarch64', 'x86_64'"
	fi

	if [ -n "$TERMUX_DEBUG" ]; then
		CFLAGS+=" -g3 -O1 -fstack-protector --param ssp-buffer-size=4 -D_FORTIFY_SOURCE=2"
	else
		if [ $TERMUX_ARCH = arm ]; then
			CFLAGS+=" -Os"
		else
			CFLAGS+=" -Oz"
		fi
	fi

	export CXXFLAGS="$CFLAGS"
	export CPPFLAGS="-I${TERMUX_PREFIX}/include"

	# If libandroid-support is declared as a dependency, link to it explicitly:
	if [ "$TERMUX_PKG_DEPENDS" != "${TERMUX_PKG_DEPENDS/libandroid-support/}" ]; then
		LDFLAGS+=" -landroid-support"
	fi

	export ac_cv_func_getpwent=no
	export ac_cv_func_getpwnam=no
	export ac_cv_func_getpwuid=no
	export ac_cv_func_sigsetmask=no
	export ac_cv_c_bigendian=no

	if [ ! -d $TERMUX_STANDALONE_TOOLCHAIN ]; then
		# Do not put toolchain in place until we are done with setup, to avoid having a half setup
		# toolchain left in place if something goes wrong (or process is just aborted):
		local _TERMUX_TOOLCHAIN_TMPDIR=${TERMUX_STANDALONE_TOOLCHAIN}-tmp
		rm -Rf $_TERMUX_TOOLCHAIN_TMPDIR

		local _NDK_ARCHNAME=$TERMUX_ARCH
		if [ "$TERMUX_ARCH" = "aarch64" ]; then
			_NDK_ARCHNAME=arm64
		elif [ "$TERMUX_ARCH" = "i686" ]; then
			_NDK_ARCHNAME=x86
		fi

		"$NDK/build/tools/make_standalone_toolchain.py" \
			--api "$TERMUX_PKG_API_LEVEL" \
			--arch $_NDK_ARCHNAME \
			--stl=libc++ \
			--install-dir $_TERMUX_TOOLCHAIN_TMPDIR

		# Remove android-support header wrapping not needed on android-21:
		rm -Rf $_TERMUX_TOOLCHAIN_TMPDIR/sysroot/usr/local

		if [ "$TERMUX_ARCH" = "aarch64" ]; then
			# Use gold by default to work around https://github.com/android-ndk/ndk/issues/148
			cp $_TERMUX_TOOLCHAIN_TMPDIR/bin/aarch64-linux-android-ld.gold \
			    $_TERMUX_TOOLCHAIN_TMPDIR/bin/aarch64-linux-android-ld
			cp $_TERMUX_TOOLCHAIN_TMPDIR/aarch64-linux-android/bin/ld.gold \
			    $_TERMUX_TOOLCHAIN_TMPDIR/aarch64-linux-android/bin/ld
		fi

		if [ "$TERMUX_ARCH" = "arm" ]; then
			# Linker wrapper script to add '--exclude-libs libgcc.a', see
			# https://github.com/android-ndk/ndk/issues/379
			# https://android-review.googlesource.com/#/c/389852/
			local linker
			for linker in ld ld.bfd ld.gold; do
				local wrap_linker=$_TERMUX_TOOLCHAIN_TMPDIR/$TERMUX_HOST_PLATFORM/bin/$linker
				local real_linker=$_TERMUX_TOOLCHAIN_TMPDIR/$TERMUX_HOST_PLATFORM/bin/$linker.real
				cp $wrap_linker $real_linker
				echo '#!/bin/bash' > $wrap_linker
				echo -n '$(dirname $0)/' >> $wrap_linker
				echo -n $linker.real >> $wrap_linker
				echo ' --exclude-libs libgcc.a "$@"' >> $wrap_linker
			done
		fi

		# Setup the cpp preprocessor:
		cp $_TERMUX_TOOLCHAIN_TMPDIR/bin/$TERMUX_HOST_PLATFORM-clang \
		   $_TERMUX_TOOLCHAIN_TMPDIR/bin/$TERMUX_HOST_PLATFORM-cpp
		sed -i 's/clang80/clang80 -E/' \
		   $_TERMUX_TOOLCHAIN_TMPDIR/bin/$TERMUX_HOST_PLATFORM-cpp

		cd $_TERMUX_TOOLCHAIN_TMPDIR/sysroot

		for f in $TERMUX_SCRIPTDIR/ndk-patches/*.patch; do
			sed "s%\@TERMUX_PREFIX\@%${TERMUX_PREFIX}%g" "$f" | \
				sed "s%\@TERMUX_HOME\@%${TERMUX_ANDROID_HOME}%g" | \
				patch --silent -p1;
		done
		# elf.h: Taken from glibc since the elf.h in the NDK is lacking.
		# ifaddrs.h: Added in android-24 unified headers, use a inline implementation for now.
		# langinfo.h: Inline implementation of nl_langinfo().
		# iconv.h: Header for iconv, implemented in libandroid-support.
		cp "$TERMUX_SCRIPTDIR"/ndk-patches/{ifaddrs.h,libintl.h,langinfo.h,iconv.h} usr/include

		# Remove <sys/shm.h> from the NDK in favour of that from the libandroid-shmem.
		# Remove <sys/sem.h> as it doesn't work for non-root.
		# Remove <glob.h> as we currently provide it from libandroid-glob.
		# Remove <spawn.h> as it's only for future (later than android-27).
		rm usr/include/sys/{shm.h,sem.h} usr/include/{glob.h,spawn.h}

		sed -i "s/define __ANDROID_API__ __ANDROID_API_FUTURE__/define __ANDROID_API__ $TERMUX_PKG_API_LEVEL/" \
			usr/include/android/api-level.h

		$TERMUX_ELF_CLEANER usr/lib/*/*/*.so

		# zlib is really version 1.2.8 in the Android platform (at least
		# starting from Android 5), not older as the NDK headers claim.
		for file in zconf.h zlib.h; do
			curl -o usr/include/$file \
				https://raw.githubusercontent.com/madler/zlib/v1.2.8/$file
		done
		unset file
		grep -lrw $_TERMUX_TOOLCHAIN_TMPDIR/sysroot/usr/include/c++/v1 -e '<version>'   | xargs -n 1 sed -i 's/<version>/\"version\"/g'
		mv $_TERMUX_TOOLCHAIN_TMPDIR $TERMUX_STANDALONE_TOOLCHAIN
	fi

	local _STL_LIBFILE_NAME=libc++_shared.so
	if [ ! -f $TERMUX_PREFIX/lib/libstdc++.so ]; then
		# Setup libc++_shared.so in $PREFIX/lib and libstdc++.so as a link to it,
		# so that other C++ using packages links to it instead of the default android
		# C++ library which does not support exceptions or STL:
		# https://developer.android.com/ndk/guides/cpp-support.html
		# We do however want to avoid installing this, to avoid problems where e.g.
		# libm.so on some i686 devices links against libstdc++.so.
		# The libc++_shared.so library will be packaged in the libc++ package
		# which is part of the base Termux installation.
		mkdir -p "$TERMUX_PREFIX/lib"
		cd "$TERMUX_PREFIX/lib"

		local _STL_LIBFILE=$TERMUX_STANDALONE_TOOLCHAIN/sysroot/usr/lib/${TERMUX_HOST_PLATFORM}/$_STL_LIBFILE_NAME

		cp "$_STL_LIBFILE" .
		$STRIP --strip-unneeded $_STL_LIBFILE_NAME
		$TERMUX_ELF_CLEANER $_STL_LIBFILE_NAME
		if [ $TERMUX_ARCH = "arm" ]; then
			# Use a linker script to get libunwind.a.
			echo 'INPUT(-lunwind -lc++_shared)' > libstdc++.so
		else
			ln -f $_STL_LIBFILE_NAME libstdc++.so
		fi
	fi

	export PKG_CONFIG_LIBDIR="$TERMUX_PKG_CONFIG_LIBDIR"
	# Create a pkg-config wrapper. We use path to host pkg-config to
	# avoid picking up a cross-compiled pkg-config later on.
	local _HOST_PKGCONFIG
	_HOST_PKGCONFIG=$(which pkg-config)
	mkdir -p $TERMUX_STANDALONE_TOOLCHAIN/bin "$PKG_CONFIG_LIBDIR"
	cat > "$PKG_CONFIG" <<-HERE
		#!/bin/sh
		export PKG_CONFIG_DIR=
		export PKG_CONFIG_LIBDIR=$PKG_CONFIG_LIBDIR
		exec $_HOST_PKGCONFIG "\$@"
	HERE
	chmod +x "$PKG_CONFIG"
}

# Apply all *.patch files for the package. Not to be overridden by packages.
termux_step_patch_package() {
	cd "$TERMUX_PKG_SRCDIR"
	local DEBUG_PATCHES=""
	if [ "$TERMUX_DEBUG" == "true" ] && [ -f $TERMUX_PKG_BUILDER_DIR/*.patch.debug ] ; then
		DEBUG_PATCHES="$(ls $TERMUX_PKG_BUILDER_DIR/*.patch.debug)"
	fi
	# Suffix patch with ".patch32" or ".patch64" to only apply for these bitnesses:
	shopt -s nullglob
	for patch in $TERMUX_PKG_BUILDER_DIR/*.patch{$TERMUX_ARCH_BITS,} $DEBUG_PATCHES; do
		test -f "$patch" && sed "s%\@TERMUX_PREFIX\@%${TERMUX_PREFIX}%g" "$patch" | \
			sed "s%\@TERMUX_HOME\@%${TERMUX_ANDROID_HOME}%g" | \
			patch --silent -p1
	done
	shopt -u nullglob
}

# Replace autotools build-aux/config.{sub,guess} with ours to add android targets.
termux_step_replace_guess_scripts() {
	cd "$TERMUX_PKG_SRCDIR"
	find . -name config.sub -exec chmod u+w '{}' \; -exec cp "$TERMUX_SCRIPTDIR/scripts/config.sub" '{}' \;
	find . -name config.guess -exec chmod u+w '{}' \; -exec cp "$TERMUX_SCRIPTDIR/scripts/config.guess" '{}' \;
}

# For package scripts to override. Called in $TERMUX_PKG_BUILDDIR.
termux_step_pre_configure() {
	return
}

termux_step_configure_autotools() {
	if [ ! -e "$TERMUX_PKG_SRCDIR/configure" ]; then return; fi

	local DISABLE_STATIC="--disable-static"
	if [ "$TERMUX_PKG_EXTRA_CONFIGURE_ARGS" != "${TERMUX_PKG_EXTRA_CONFIGURE_ARGS/--enable-static/}" ]; then
		# Do not --disable-static if package explicitly enables it (e.g. gdb needs enable-static to build)
		DISABLE_STATIC=""
	fi

	local DISABLE_NLS="--disable-nls"
	if [ "$TERMUX_PKG_EXTRA_CONFIGURE_ARGS" != "${TERMUX_PKG_EXTRA_CONFIGURE_ARGS/--enable-nls/}" ]; then
		# Do not --disable-nls if package explicitly enables it (for gettext itself)
		DISABLE_NLS=""
	fi

	local ENABLE_SHARED="--enable-shared"
	if [ "$TERMUX_PKG_EXTRA_CONFIGURE_ARGS" != "${TERMUX_PKG_EXTRA_CONFIGURE_ARGS/--disable-shared/}" ]; then
		ENABLE_SHARED=""
	fi

	local HOST_FLAG="--host=$TERMUX_HOST_PLATFORM"
	if [ "$TERMUX_PKG_EXTRA_CONFIGURE_ARGS" != "${TERMUX_PKG_EXTRA_CONFIGURE_ARGS/--host=/}" ]; then
		HOST_FLAG=""
	fi

	local LIBEXEC_FLAG="--libexecdir=$TERMUX_PREFIX/libexec"
	if [ "$TERMUX_PKG_EXTRA_CONFIGURE_ARGS" != "${TERMUX_PKG_EXTRA_CONFIGURE_ARGS/--libexecdir=/}" ]; then
		LIBEXEC_FLAG=""
	fi

	local QUIET_BUILD=
	if [ $TERMUX_QUIET_BUILD = true ]; then
		QUIET_BUILD="--enable-silent-rules --silent --quiet"
	fi

	# Some packages provides a $PKG-config script which some configure scripts pickup instead of pkg-config:
	mkdir "$TERMUX_PKG_TMPDIR/config-scripts"
	for f in $TERMUX_PREFIX/bin/*config; do
		test -f "$f" && cp "$f" "$TERMUX_PKG_TMPDIR/config-scripts"
	done
	export PATH=$TERMUX_PKG_TMPDIR/config-scripts:$PATH

	# Avoid gnulib wrapping of functions when cross compiling. See
	# http://wiki.osdev.org/Cross-Porting_Software#Gnulib
	# https://gitlab.com/sortix/sortix/wikis/Gnulib
	# https://github.com/termux/termux-packages/issues/76
	local AVOID_GNULIB=""
	AVOID_GNULIB+=" ac_cv_func_nl_langinfo=yes"
	AVOID_GNULIB+=" ac_cv_func_calloc_0_nonnull=yes"
	AVOID_GNULIB+=" ac_cv_func_chown_works=yes"
	AVOID_GNULIB+=" ac_cv_func_getgroups_works=yes"
	AVOID_GNULIB+=" ac_cv_func_malloc_0_nonnull=yes"
	AVOID_GNULIB+=" ac_cv_func_realloc_0_nonnull=yes"
	AVOID_GNULIB+=" am_cv_func_working_getline=yes"
	AVOID_GNULIB+=" gl_cv_func_dup2_works=yes"
	AVOID_GNULIB+=" gl_cv_func_fcntl_f_dupfd_cloexec=yes"
	AVOID_GNULIB+=" gl_cv_func_fcntl_f_dupfd_works=yes"
	AVOID_GNULIB+=" gl_cv_func_fnmatch_posix=yes"
	AVOID_GNULIB+=" gl_cv_func_getcwd_abort_bug=no"
	AVOID_GNULIB+=" gl_cv_func_getcwd_null=yes"
	AVOID_GNULIB+=" gl_cv_func_getcwd_path_max=yes"
	AVOID_GNULIB+=" gl_cv_func_getcwd_posix_signature=yes"
	AVOID_GNULIB+=" gl_cv_func_gettimeofday_clobber=no"
	AVOID_GNULIB+=" gl_cv_func_gettimeofday_posix_signature=yes"
	AVOID_GNULIB+=" gl_cv_func_link_works=yes"
	AVOID_GNULIB+=" gl_cv_func_lstat_dereferences_slashed_symlink=yes"
	AVOID_GNULIB+=" gl_cv_func_malloc_0_nonnull=yes"
	AVOID_GNULIB+=" gl_cv_func_memchr_works=yes"
	AVOID_GNULIB+=" gl_cv_func_mkdir_trailing_dot_works=yes"
	AVOID_GNULIB+=" gl_cv_func_mkdir_trailing_slash_works=yes"
	AVOID_GNULIB+=" gl_cv_func_mkfifo_works=yes"
	AVOID_GNULIB+=" gl_cv_func_mknod_works=yes"
	AVOID_GNULIB+=" gl_cv_func_realpath_works=yes"
	AVOID_GNULIB+=" gl_cv_func_select_detects_ebadf=yes"
	AVOID_GNULIB+=" gl_cv_func_snprintf_posix=yes"
	AVOID_GNULIB+=" gl_cv_func_snprintf_retval_c99=yes"
	AVOID_GNULIB+=" gl_cv_func_snprintf_truncation_c99=yes"
	AVOID_GNULIB+=" gl_cv_func_stat_dir_slash=yes"
	AVOID_GNULIB+=" gl_cv_func_stat_file_slash=yes"
	AVOID_GNULIB+=" gl_cv_func_strerror_0_works=yes"
	AVOID_GNULIB+=" gl_cv_func_symlink_works=yes"
	AVOID_GNULIB+=" gl_cv_func_tzset_clobber=no"
	AVOID_GNULIB+=" gl_cv_func_unlink_honors_slashes=yes"
	AVOID_GNULIB+=" gl_cv_func_unlink_honors_slashes=yes"
	AVOID_GNULIB+=" gl_cv_func_vsnprintf_posix=yes"
	AVOID_GNULIB+=" gl_cv_func_vsnprintf_zerosize_c99=yes"
	AVOID_GNULIB+=" gl_cv_func_wcwidth_works=yes"
	AVOID_GNULIB+=" gl_cv_func_working_getdelim=yes"
	AVOID_GNULIB+=" gl_cv_func_working_mkstemp=yes"
	AVOID_GNULIB+=" gl_cv_func_working_mktime=yes"
	AVOID_GNULIB+=" gl_cv_func_working_strerror=yes"
	AVOID_GNULIB+=" gl_cv_header_working_fcntl_h=yes"
	AVOID_GNULIB+=" gl_cv_C_locale_sans_EILSEQ=yes"

	# NOTE: We do not want to quote AVOID_GNULIB as we want word expansion.
	# shellcheck disable=SC2086
	env $AVOID_GNULIB "$TERMUX_PKG_SRCDIR/configure" \
		--disable-dependency-tracking \
		--prefix=$TERMUX_PREFIX \
		--libdir=$TERMUX_PREFIX/lib \
		--disable-rpath --disable-rpath-hack \
		$HOST_FLAG \
		$TERMUX_PKG_EXTRA_CONFIGURE_ARGS \
		$DISABLE_NLS \
		$ENABLE_SHARED \
		$DISABLE_STATIC \
		$LIBEXEC_FLAG \
		$QUIET_BUILD
}

termux_step_configure_cmake() {
	termux_setup_cmake

	local TOOLCHAIN_ARGS="-DCMAKE_ANDROID_STANDALONE_TOOLCHAIN=$TERMUX_STANDALONE_TOOLCHAIN"
	local BUILD_TYPE=MinSizeRel
	test -n "$TERMUX_DEBUG" && BUILD_TYPE=Debug

	local CMAKE_PROC=$TERMUX_ARCH
	test $CMAKE_PROC == "arm" && CMAKE_PROC='armv7-a'
	local MAKE_PROGRAM_PATH
	if [ $TERMUX_CMAKE_BUILD = Ninja ]; then
		termux_setup_ninja
		MAKE_PROGRAM_PATH=$(which ninja)
	else
		MAKE_PROGRAM_PATH=$(which make)
	fi
	CFLAGS+=" --target=$CCTERMUX_HOST_PLATFORM -fno-addrsig"
	CXXFLAGS+=" --target=$CCTERMUX_HOST_PLATFORM -fno-addrsig"
	LDFLAGS+=" --target=$CCTERMUX_HOST_PLATFORM"

	# XXX: CMAKE_{AR,RANLIB} needed for at least jsoncpp build to not
	# pick up cross compiled binutils tool in $PREFIX/bin:
	cmake -G "$TERMUX_CMAKE_BUILD" "$TERMUX_PKG_SRCDIR" \
		-DCMAKE_AR="$(which $AR)" \
		-DCMAKE_UNAME="$(which uname)" \
		-DCMAKE_RANLIB="$(which $RANLIB)" \
		-DCMAKE_BUILD_TYPE=$BUILD_TYPE \
		-DCMAKE_CROSSCOMPILING=True \
		-DCMAKE_C_FLAGS="$CFLAGS $CPPFLAGS" \
		-DCMAKE_CXX_FLAGS="$CXXFLAGS $CPPFLAGS" \
		-DCMAKE_LINKER="$TERMUX_STANDALONE_TOOLCHAIN/bin/$LD $LDFLAGS" \
		-DCMAKE_FIND_ROOT_PATH=$TERMUX_PREFIX \
		-DCMAKE_FIND_ROOT_PATH_MODE_INCLUDE=ONLY \
		-DCMAKE_FIND_ROOT_PATH_MODE_LIBRARY=ONLY \
		-DCMAKE_INSTALL_PREFIX=$TERMUX_PREFIX \
		-DCMAKE_MAKE_PROGRAM=$MAKE_PROGRAM_PATH \
		-DCMAKE_SYSTEM_PROCESSOR=$CMAKE_PROC \
		-DCMAKE_SYSTEM_NAME=Android \
		-DCMAKE_SYSTEM_VERSION=$TERMUX_PKG_API_LEVEL \
		-DCMAKE_SKIP_INSTALL_RPATH=ON \
		-DCMAKE_USE_SYSTEM_LIBRARIES=True \
		-DDOXYGEN_EXECUTABLE= \
		-DBUILD_TESTING=OFF \
		$TERMUX_PKG_EXTRA_CONFIGURE_ARGS $TOOLCHAIN_ARGS
}

termux_step_configure_meson() {
	termux_setup_meson
	CC=gcc CXX=g++ $TERMUX_MESON \
		$TERMUX_PKG_SRCDIR \
		$TERMUX_PKG_BUILDDIR \
		--cross-file $TERMUX_MESON_CROSSFILE \
		--prefix $TERMUX_PREFIX \
		--libdir lib \
		--buildtype minsize \
		--strip \
		$TERMUX_PKG_EXTRA_CONFIGURE_ARGS
}

termux_step_configure() {
	if [ "$TERMUX_PKG_FORCE_CMAKE" == 'no' ] && [ -f "$TERMUX_PKG_SRCDIR/configure" ]; then
		termux_step_configure_autotools
	elif [ -f "$TERMUX_PKG_SRCDIR/CMakeLists.txt" ]; then
		termux_step_configure_cmake
	elif [ -f "$TERMUX_PKG_SRCDIR/meson.build" ]; then
		termux_step_configure_meson
	fi
}

termux_step_post_configure() {
	return
}

termux_step_make() {
	local QUIET_BUILD=
	if [ $TERMUX_QUIET_BUILD = true ]; then
		QUIET_BUILD="-s"
	fi

	if test -f build.ninja; then
		ninja -w dupbuild=warn -j $TERMUX_MAKE_PROCESSES
	elif ls ./*akefile &> /dev/null || [ ! -z "$TERMUX_PKG_EXTRA_MAKE_ARGS" ]; then
		if [ -z "$TERMUX_PKG_EXTRA_MAKE_ARGS" ]; then
			make -j $TERMUX_MAKE_PROCESSES $QUIET_BUILD
		else
			make -j $TERMUX_MAKE_PROCESSES $QUIET_BUILD ${TERMUX_PKG_EXTRA_MAKE_ARGS}
		fi
	fi
}

termux_step_make_install() {
	if test -f build.ninja; then
		ninja -w dupbuild=warn -j $TERMUX_MAKE_PROCESSES install
	elif ls ./*akefile &> /dev/null || [ ! -z "$TERMUX_PKG_EXTRA_MAKE_ARGS" ]; then
		: "${TERMUX_PKG_MAKE_INSTALL_TARGET:="install"}"
		# Some packages have problem with parallell install, and it does not buy much, so use -j 1.
		if [ -z "$TERMUX_PKG_EXTRA_MAKE_ARGS" ]; then
			make -j 1 ${TERMUX_PKG_MAKE_INSTALL_TARGET}
		else
			make -j 1 ${TERMUX_PKG_EXTRA_MAKE_ARGS} ${TERMUX_PKG_MAKE_INSTALL_TARGET}
		fi
	elif test -f Cargo.toml; then
		termux_setup_rust
		cargo install \
			--path . \
			--force \
			--target $CARGO_TARGET_NAME \
			--root $TERMUX_PREFIX \
			$TERMUX_PKG_EXTRA_CONFIGURE_ARGS
		# https://github.com/rust-lang/cargo/issues/3316:
		rm $TERMUX_PREFIX/.crates.toml
	fi
}

# Hook function for package scripts to override.
termux_step_post_make_install() {
	return
}

termux_step_extract_into_massagedir() {
	local TARBALL_ORIG=$TERMUX_PKG_PACKAGEDIR/${TERMUX_PKG_NAME}_orig.tar.gz

	# Build diff tar with what has changed during the build:
	cd $TERMUX_PREFIX
	tar -N "$TERMUX_BUILD_TS_FILE" \
		--exclude='lib/libc++_shared.so' --exclude='lib/libstdc++.so' \
		-czf "$TARBALL_ORIG" .

	# Extract tar in order to massage it
	mkdir -p "$TERMUX_PKG_MASSAGEDIR/$TERMUX_PREFIX"
	cd "$TERMUX_PKG_MASSAGEDIR/$TERMUX_PREFIX"
	tar xf "$TARBALL_ORIG"
	rm "$TARBALL_ORIG"
}

termux_step_massage() {
	cd "$TERMUX_PKG_MASSAGEDIR/$TERMUX_PREFIX"

	# Remove lib/charset.alias which is installed by gettext-using packages:
	rm -f lib/charset.alias

	# Remove non-english man pages:
	test -d share/man && (cd share/man; for f in $(ls | grep -v man); do rm -Rf $f; done )

	if [ -z "${TERMUX_PKG_KEEP_INFOPAGES+x}" ]; then
		# Remove info pages:
		rm -Rf share/info
	fi

	# Remove locale files we're not interested in::
	rm -Rf share/locale
	if [ -z "${TERMUX_PKG_KEEP_SHARE_DOC+x}" ]; then
		# Remove info pages:
		rm -Rf share/doc
	fi

	# Remove old kept libraries (readline):
	find . -name '*.old' -delete

	# Remove static libraries:
	if [ $TERMUX_PKG_KEEP_STATIC_LIBRARIES = "false" ]; then
		find . -name '*.a' -delete
		find . -name '*.la' -delete
	fi

	# Move over sbin to bin:
	for file in sbin/*; do if test -f "$file"; then mv "$file" bin/; fi; done

	# Remove world permissions and add write permissions.
	# The -f flag is used to suppress warnings about dangling symlinks (such
	# as ones to /system/... which may not exist on the build machine):
	find . -exec chmod -f u+w,g-rwx,o-rwx \{\} \;

	if [ "$TERMUX_DEBUG" = "" ]; then
		# Strip binaries. file(1) may fail for certain unusual files, so disable pipefail.
		set +e +o pipefail
		find . -type f | xargs -r file | grep -E "(executable|shared object)" | grep ELF | cut -f 1 -d : | \
			xargs -r "$STRIP" --strip-unneeded --preserve-dates
		set -e -o pipefail
	fi
	# Remove DT_ entries which the android 5.1 linker warns about:
	find . -type f -print0 | xargs -r -0 "$TERMUX_ELF_CLEANER"

	# Fix shebang paths:
	while IFS= read -r -d '' file
	do
		head -c 100 "$file" | grep -E "^#\!.*\\/bin\\/.*" | grep -q -E -v "^#\! ?\\/system" && sed --follow-symlinks -i -E "1 s@^#\!(.*)/bin/(.*)@#\!$TERMUX_PREFIX/bin/\2@" "$file"
	done < <(find -L . -type f -print0)

	test ! -z "$TERMUX_PKG_RM_AFTER_INSTALL" && rm -Rf $TERMUX_PKG_RM_AFTER_INSTALL

	find . -type d -empty -delete # Remove empty directories

	if [ -d share/man ]; then
		# Compress man pages with gzip:
		find share/man -type f -print0 | xargs -r -0 gzip
		# Update man page symlinks, e.g. unzstd.1 -> zstd.1:
		while IFS= read -r -d '' file
		do
			local _link_value
			_link_value=$(readlink $file)
			rm $file
			ln -s $_link_value.gz $file.gz
		done < <(find share/man -type l -print0)
	fi

	# Sub packages:
	if [ -d include ] && [ -z "${TERMUX_PKG_NO_DEVELSPLIT}" ]; then
		# Add virtual -dev sub package if there are include files:
		local _DEVEL_SUBPACKAGE_FILE=$TERMUX_PKG_TMPDIR/${TERMUX_PKG_NAME}-dev.subpackage.sh
		echo TERMUX_SUBPKG_INCLUDE=\"include share/vala share/man/man3 lib/pkgconfig share/aclocal lib/cmake $TERMUX_PKG_INCLUDE_IN_DEVPACKAGE\" > "$_DEVEL_SUBPACKAGE_FILE"
		echo "TERMUX_SUBPKG_DESCRIPTION=\"Development files for ${TERMUX_PKG_NAME}\"" >> "$_DEVEL_SUBPACKAGE_FILE"
		if [ -n "$TERMUX_PKG_DEVPACKAGE_DEPENDS" ]; then
			echo "TERMUX_SUBPKG_DEPENDS=\"$TERMUX_PKG_NAME,$TERMUX_PKG_DEVPACKAGE_DEPENDS\"" >> "$_DEVEL_SUBPACKAGE_FILE"
		else
			echo "TERMUX_SUBPKG_DEPENDS=\"$TERMUX_PKG_NAME\"" >> "$_DEVEL_SUBPACKAGE_FILE"
		fi
	fi
	# Now build all sub packages
	rm -Rf "$TERMUX_TOPDIR/$TERMUX_PKG_NAME/subpackages"
	for subpackage in $TERMUX_PKG_BUILDER_DIR/*.subpackage.sh $TERMUX_PKG_TMPDIR/*subpackage.sh; do
		test ! -f "$subpackage" && continue
		local SUB_PKG_NAME
		SUB_PKG_NAME=$(basename "$subpackage" .subpackage.sh)
		# Default value is same as main package, but sub package may override:
		local TERMUX_SUBPKG_PLATFORM_INDEPENDENT=$TERMUX_PKG_PLATFORM_INDEPENDENT
		local SUB_PKG_DIR=$TERMUX_TOPDIR/$TERMUX_PKG_NAME/subpackages/$SUB_PKG_NAME
		local TERMUX_SUBPKG_DEPENDS=""
		local TERMUX_SUBPKG_CONFLICTS=""
		local TERMUX_SUBPKG_REPLACES=""
		local TERMUX_SUBPKG_CONFFILES=""
		local SUB_PKG_MASSAGE_DIR=$SUB_PKG_DIR/massage/$TERMUX_PREFIX
		local SUB_PKG_PACKAGE_DIR=$SUB_PKG_DIR/package
		mkdir -p "$SUB_PKG_MASSAGE_DIR" "$SUB_PKG_PACKAGE_DIR"

		# shellcheck source=/dev/null
		source "$subpackage"

		for includeset in $TERMUX_SUBPKG_INCLUDE; do
			local _INCLUDE_DIRSET
			_INCLUDE_DIRSET=$(dirname "$includeset")
			test "$_INCLUDE_DIRSET" = "." && _INCLUDE_DIRSET=""
			if [ -e "$includeset" ] || [ -L "$includeset" ]; then
				# Add the -L clause to handle relative symbolic links:
				mkdir -p "$SUB_PKG_MASSAGE_DIR/$_INCLUDE_DIRSET"
				mv "$includeset" "$SUB_PKG_MASSAGE_DIR/$_INCLUDE_DIRSET"
			fi
		done

		local SUB_PKG_ARCH=$TERMUX_ARCH
		test -n "$TERMUX_SUBPKG_PLATFORM_INDEPENDENT" && SUB_PKG_ARCH=all

		cd "$SUB_PKG_DIR/massage"
		local SUB_PKG_INSTALLSIZE
		SUB_PKG_INSTALLSIZE=$(du -sk . | cut -f 1)
		tar -cJf "$SUB_PKG_PACKAGE_DIR/data.tar.xz" .

		mkdir -p DEBIAN
		cd DEBIAN
		cat > control <<-HERE
			Package: $SUB_PKG_NAME
			Architecture: ${SUB_PKG_ARCH}
			Installed-Size: ${SUB_PKG_INSTALLSIZE}
			Maintainer: $TERMUX_PKG_MAINTAINER
			Version: $TERMUX_PKG_FULLVERSION
			Homepage: $TERMUX_PKG_HOMEPAGE
		HERE
		test ! -z "$TERMUX_SUBPKG_DEPENDS" && echo "Depends: $TERMUX_SUBPKG_DEPENDS" >> control
		test ! -z "$TERMUX_SUBPKG_CONFLICTS" && echo "Conflicts: $TERMUX_SUBPKG_CONFLICTS" >> control
		test ! -z "$TERMUX_SUBPKG_REPLACES" && echo "Replaces: $TERMUX_SUBPKG_REPLACES" >> control
		echo "Description: $TERMUX_SUBPKG_DESCRIPTION" >> control
		tar -czf "$SUB_PKG_PACKAGE_DIR/control.tar.gz" .

		for f in $TERMUX_SUBPKG_CONFFILES; do echo "$TERMUX_PREFIX/$f" >> conffiles; done

		# Create the actual .deb file:
		TERMUX_SUBPKG_DEBFILE=$TERMUX_DEBDIR/${SUB_PKG_NAME}${DEBUG}_${TERMUX_PKG_FULLVERSION}_${SUB_PKG_ARCH}.deb
		test ! -f "$TERMUX_COMMON_CACHEDIR/debian-binary" && echo "2.0" > "$TERMUX_COMMON_CACHEDIR/debian-binary"
		ar cr "$TERMUX_SUBPKG_DEBFILE" \
				   "$TERMUX_COMMON_CACHEDIR/debian-binary" \
				   "$SUB_PKG_PACKAGE_DIR/control.tar.gz" \
				   "$SUB_PKG_PACKAGE_DIR/data.tar.xz"

		# Go back to main package:
		cd "$TERMUX_PKG_MASSAGEDIR/$TERMUX_PREFIX"
	done

	# .. remove empty directories (NOTE: keep this last):
	find . -type d -empty -delete
	# Make sure user can read and write all files (problem with dpkg otherwise):
	chmod -R u+rw .
}

termux_step_post_massage() {
	return
}

# Create data.tar.gz with files to package. Not to be overridden by package scripts.
termux_step_create_datatar() {
	# Create data tarball containing files to package:
	cd "$TERMUX_PKG_MASSAGEDIR"

	local HARDLINKS
	HARDLINKS="$(find . -type f -links +1)"
	if [ -n "$HARDLINKS" ]; then
		termux_error_exit "Package contains hard links: $HARDLINKS"
	fi

	if [ -z "${TERMUX_PKG_METAPACKAGE+x}" ] && [ "$(find . -type f)" = "" ]; then
		termux_error_exit "No files in package"
	fi
	tar -cJf "$TERMUX_PKG_PACKAGEDIR/data.tar.xz" .
}

termux_step_create_debscripts() {
	return
}

# Create the build deb file. Not to be overridden by package scripts.
termux_step_create_debfile() {
	# Get install size. This will be written as the "Installed-Size" deb field so is measured in 1024-byte blocks:
	local TERMUX_PKG_INSTALLSIZE
	TERMUX_PKG_INSTALLSIZE=$(du -sk . | cut -f 1)

	# From here on TERMUX_ARCH is set to "all" if TERMUX_PKG_PLATFORM_INDEPENDENT is set by the package
	test -n "$TERMUX_PKG_PLATFORM_INDEPENDENT" && TERMUX_ARCH=all

	mkdir -p DEBIAN
	cat > DEBIAN/control <<-HERE
		Package: $TERMUX_PKG_NAME
		Architecture: ${TERMUX_ARCH}
		Installed-Size: ${TERMUX_PKG_INSTALLSIZE}
		Maintainer: $TERMUX_PKG_MAINTAINER
		Version: $TERMUX_PKG_FULLVERSION
		Homepage: $TERMUX_PKG_HOMEPAGE
	HERE
	test ! -z "$TERMUX_PKG_BREAKS" && echo "Breaks: $TERMUX_PKG_BREAKS" >> DEBIAN/control
	test ! -z "$TERMUX_PKG_DEPENDS" && echo "Depends: $TERMUX_PKG_DEPENDS" >> DEBIAN/control
	test ! -z "$TERMUX_PKG_ESSENTIAL" && echo "Essential: yes" >> DEBIAN/control
	test ! -z "$TERMUX_PKG_CONFLICTS" && echo "Conflicts: $TERMUX_PKG_CONFLICTS" >> DEBIAN/control
	test ! -z "$TERMUX_PKG_RECOMMENDS" && echo "Recommends: $TERMUX_PKG_RECOMMENDS" >> DEBIAN/control
	test ! -z "$TERMUX_PKG_REPLACES" && echo "Replaces: $TERMUX_PKG_REPLACES" >> DEBIAN/control
	test ! -z "$TERMUX_PKG_PROVIDES" && echo "Provides: $TERMUX_PKG_PROVIDES" >> DEBIAN/control
	test ! -z "$TERMUX_PKG_SUGGESTS" && echo "Suggests: $TERMUX_PKG_SUGGESTS" >> DEBIAN/control
	echo "Description: $TERMUX_PKG_DESCRIPTION" >> DEBIAN/control

	# Create DEBIAN/conffiles (see https://www.debian.org/doc/debian-policy/ap-pkg-conffiles.html):
	for f in $TERMUX_PKG_CONFFILES; do echo "$TERMUX_PREFIX/$f" >> DEBIAN/conffiles; done

	# Allow packages to create arbitrary control files.
	# XXX: Should be done in a better way without a function?
	cd DEBIAN
	termux_step_create_debscripts

	# Create control.tar.gz
	tar -czf "$TERMUX_PKG_PACKAGEDIR/control.tar.gz" .

	test ! -f "$TERMUX_COMMON_CACHEDIR/debian-binary" && echo "2.0" > "$TERMUX_COMMON_CACHEDIR/debian-binary"
	TERMUX_PKG_DEBFILE=$TERMUX_DEBDIR/${TERMUX_PKG_NAME}${DEBUG}_${TERMUX_PKG_FULLVERSION}_${TERMUX_ARCH}.deb
	# Create the actual .deb file:
	ar cr "$TERMUX_PKG_DEBFILE" \
	       "$TERMUX_COMMON_CACHEDIR/debian-binary" \
	       "$TERMUX_PKG_PACKAGEDIR/control.tar.gz" \
	       "$TERMUX_PKG_PACKAGEDIR/data.tar.xz"
}

termux_step_compare_debs() {
	if [ "${TERMUX_INSTALL_DEPS}" = true ]; then
		cd ${TERMUX_SCRIPTDIR}

		for DEB in $TERMUX_PKG_NAME $(basename $TERMUX_PKG_BUILDER_DIR/*.subpackage.sh | sed 's%\.subpackage\.sh%%g') $(basename $TERMUX_PKG_TMPDIR/*.subpackage.sh | sed 's%\.subpackage\.sh%%g'); do
			read DEB_ARCH DEB_VERSION <<< $(termux_extract_dep_info "$DEB")
			termux_download_deb $DEB $DEB_ARCH $DEB_VERSION \
			    &&	(
				DEB_FILE=${DEB}_${DEB_VERSION}_${DEB_ARCH}.deb

				# `|| true` to prevent debdiff's exit code from stopping build
				debdiff $TERMUX_DEBDIR/$DEB_FILE $TERMUX_COMMON_CACHEDIR-$TERMUX_ARCH/$DEB_FILE || true
				) || echo "Download of ${DEB}@${DEB_VERSION} failed, not comparing debs"
			echo ""
		done
	fi
}

# Finish the build. Not to be overridden by package scripts.
termux_step_finish_build() {
	echo "termux - build of '$TERMUX_PKG_NAME' done"
	test -t 1 && printf "\033]0;%s - DONE\007" "$TERMUX_PKG_NAME"
	mkdir -p /data/data/.built-packages
	echo "$TERMUX_PKG_FULLVERSION" > "/data/data/.built-packages/$TERMUX_PKG_NAME"
	exit 0
}

termux_step_handle_arguments "$@"
termux_step_setup_variables
termux_step_handle_buildarch
termux_step_get_repo_files
termux_step_start_build
termux_step_extract_package
cd "$TERMUX_PKG_SRCDIR"
termux_step_post_extract_package
termux_step_handle_hostbuild
termux_step_setup_toolchain
termux_step_patch_package
termux_step_replace_guess_scripts
cd "$TERMUX_PKG_SRCDIR"
termux_step_pre_configure
cd "$TERMUX_PKG_BUILDDIR"
termux_step_configure
cd "$TERMUX_PKG_BUILDDIR"
termux_step_post_configure
cd "$TERMUX_PKG_BUILDDIR"
termux_step_make
cd "$TERMUX_PKG_BUILDDIR"
termux_step_make_install
cd "$TERMUX_PKG_BUILDDIR"
termux_step_post_make_install
cd "$TERMUX_PKG_MASSAGEDIR"
termux_step_extract_into_massagedir
cd "$TERMUX_PKG_MASSAGEDIR"
termux_step_massage
cd "$TERMUX_PKG_MASSAGEDIR/$TERMUX_PREFIX"
termux_step_post_massage
termux_step_create_datatar
termux_step_create_debfile
termux_step_compare_debs
termux_step_finish_build