diff --git a/swift/utils/build-script-impl b/swift/utils/build-script-impl
index b1d060328bc..218c9215260 100755
--- a/swift/utils/build-script-impl
+++ b/swift/utils/build-script-impl
@@ -703,6 +705,7 @@ function set_build_options_for_host() {
       llvm_cmake_options+=(
           -DLLVM_TOOL_COMPILER_RT_BUILD:BOOL="$(false_true ${SKIP_BUILD_COMPILER_RT})"
           -DLLVM_BUILD_EXTERNAL_COMPILER_RT:BOOL="$(false_true ${SKIP_BUILD_COMPILER_RT})"
+          -DCOMPILER_RT_INCLUDE_TESTS:BOOL="OFF"
       )
     fi
 
@@ -743,6 +743,7 @@ function set_build_options_for_host() {
 
     llvm_cmake_options+=(
         -DLLVM_LIT_ARGS="${LLVM_LIT_ARGS} -j ${BUILD_JOBS}"
+        -DDEFAULT_SYSROOT:STRING="$(dirname @TERMUX_PREFIX@)"
     )
     swift_cmake_options+=(
         -DLLVM_LIT_ARGS="${LLVM_LIT_ARGS} -j ${BUILD_JOBS}"
@@ -1028,7 +1032,7 @@ function make_relative_symlink() {
 CROSS_COMPILE_HOSTS=($CROSS_COMPILE_HOSTS)
 for t in "${CROSS_COMPILE_HOSTS[@]}"; do
     case ${t} in
-        macosx-arm64* | iphone* | appletv* | watch* | linux-armv6 | linux-armv7 )
+        macosx-arm64* | iphone* | appletv* | watch* | linux-armv6 | linux-armv7 | android-* )
             ;;
         *)
             echo "Unknown host to cross-compile for: ${t}"
@@ -1060,7 +1064,7 @@ function get_host_install_destdir() {
             # This assumes that all hosts are merged to the lipo.
             local host_install_destdir="${INSTALL_DESTDIR}"
         else
-            local host_install_destdir="${INSTALL_DESTDIR}/${host}"
+            local host_install_destdir="${INSTALL_DESTDIR}"
         fi
     else
         local host_install_destdir="${INSTALL_DESTDIR}"
@@ -1422,6 +1426,38 @@ function swift_c_flags() {
     fi
 }
 
+function common_swift_flags() {
+    local host=$1
+    if [[ $(is_cross_tools_host ${host}) ]] ; then
+        case $host in
+            android-*)
+                echo -n "${TERMUX_SWIFT_FLAGS}"
+                ;;
+            *)
+                echo "error: Swift cross-compilation flags for ${host} have not been set."
+                exit 1
+                ;;
+        esac
+    fi
+}
+
+function add_cross_cmake_options() {
+    local host=$1
+    local -n options=$2
+    case $host in
+        android-*)
+            local NDK_ARCH=$ANDROID_ARCH
+            test $NDK_ARCH == 'armv7' && NDK_ARCH='armv7-a'
+            options+=(
+                -DCMAKE_SYSTEM_NAME=Android
+                -DCMAKE_SYSTEM_VERSION=${ANDROID_API_LEVEL}
+                -DCMAKE_SYSTEM_PROCESSOR=${NDK_ARCH}
+                -DCMAKE_ANDROID_STANDALONE_TOOLCHAIN:PATH=${ANDROID_NDK}
+            )
+            ;;
+    esac
+}
+
 function cmake_config_opt() {
     product=$1
     if [[ "${CMAKE_GENERATOR}" == "Xcode" ]] ; then
@@ -1546,6 +1578,10 @@ for host in "${ALL_HOSTS[@]}"; do
                 )
                 if [[ $(is_cross_tools_host ${host}) ]] ; then
                     add_cross_cmake_options ${host} cmake_options
+                    cmake_options+=(
+                        -DCMAKE_C_FLAGS="$CFLAGS --target=$CCTERMUX_HOST_PLATFORM $CPPFLAGS"
+                        -DCMAKE_CXX_FLAGS="$CXXFLAGS --target=$CCTERMUX_HOST_PLATFORM $CPPFLAGS"
+                    )
                 fi
                 build_targets=(all)
                 ;;
@@ -1623,7 +1675,7 @@ for host in "${ALL_HOSTS[@]}"; do
                     -DCLANG_TOOL_ARCMT_TEST_BUILD=NO
                     -DCLANG_TOOL_C_ARCMT_TEST_BUILD=NO
                     -DCLANG_TOOL_C_INDEX_TEST_BUILD=NO
-                    -DCLANG_TOOL_DRIVER_BUILD=$(false_true "${BUILD_RUNTIME_WITH_HOST_COMPILER}")
+                    -DCLANG_TOOL_DRIVER_BUILD=TRUE
                     -DCLANG_TOOL_DIAGTOOL_BUILD=NO
                     -DCLANG_TOOL_SCAN_BUILD_BUILD=NO
                     -DCLANG_TOOL_SCAN_VIEW_BUILD=NO
@@ -1652,6 +1688,10 @@ for host in "${ALL_HOSTS[@]}"; do
                         -DLLVM_NATIVE_BUILD=$(build_directory "${LOCAL_HOST}" llvm)
                     )
                     add_cross_cmake_options ${host} cmake_options
+                    cmake_options+=(
+                        -DCMAKE_CXX_FLAGS="$CXXFLAGS --target=$CCTERMUX_HOST_PLATFORM $CPPFLAGS"
+                        -DCMAKE_EXE_LINKER_FLAGS="$LDFLAGS --target=$CCTERMUX_HOST_PLATFORM"
+                    )
                 fi
 
                 ;;
@@ -1768,7 +1812,7 @@ for host in "${ALL_HOSTS[@]}"; do
                     )
                 fi
 
-                if [[ ! "${SKIP_BUILD_ANDROID}" ]]; then
+                if [[ $(is_cross_tools_host ${host}) ]] ; then
                     cmake_options=(
                         "${cmake_options[@]}"
                         -DSWIFT_ANDROID_NDK_PATH:STRING="${ANDROID_NDK}"
@@ -2045,6 +2045,8 @@ for host in "${ALL_HOSTS[@]}"; do
                     cmake_options+=(
                         -DCMAKE_FIND_ROOT_PATH:PATH="${CROSS_COMPILE_DEPS_PATH}"
                         -DCMAKE_FIND_ROOT_PATH_MODE_PROGRAM=NEVER
+                        -DCMAKE_CXX_FLAGS="$CXXFLAGS --target=$CCTERMUX_HOST_PLATFORM $CPPFLAGS"
+                        -DCMAKE_EXE_LINKER_FLAGS="$LDFLAGS --target=$CCTERMUX_HOST_PLATFORM"
                     )
                 fi
 
@@ -2199,6 +2201,9 @@ for host in "${ALL_HOSTS[@]}"; do
                     cmake_options+=(
                         -DCMAKE_FIND_ROOT_PATH:PATH="${CROSS_COMPILE_DEPS_PATH}"
                         -DCMAKE_FIND_ROOT_PATH_MODE_PROGRAM=NEVER
+                        -DCMAKE_C_FLAGS="$CFLAGS --target=$CCTERMUX_HOST_PLATFORM $CPPFLAGS"
+                        -DCMAKE_EXE_LINKER_FLAGS="$LDFLAGS --target=$CCTERMUX_HOST_PLATFORM"
+                        -DCMAKE_HAVE_LIBC_PTHREAD=True
                     )
                 fi
 
@@ -2239,6 +2243,14 @@ for host in "${ALL_HOSTS[@]}"; do
                   )
                   if [[ $(is_cross_tools_host ${host}) ]] ; then
                       add_cross_cmake_options ${host} cmake_options
+                      cmake_options+=(
+                          -DCMAKE_FIND_ROOT_PATH:PATH="${CROSS_COMPILE_DEPS_PATH}"
+                          -DCMAKE_FIND_ROOT_PATH_MODE_PROGRAM=NEVER
+                          -DCMAKE_FIND_ROOT_PATH_MODE_LIBRARY=ONLY
+                          -DCMAKE_C_FLAGS="$CFLAGS --target=$CCTERMUX_HOST_PLATFORM $CPPFLAGS"
+                          -DCMAKE_EXE_LINKER_FLAGS="$LDFLAGS --target=$CCTERMUX_HOST_PLATFORM"
+                          -DCMAKE_SHARED_LINKER_FLAGS="$LDFLAGS --target=$CCTERMUX_HOST_PLATFORM"
+                      )
                   fi
                 ;;
                 esac
@@ -2929,7 +2999,20 @@ for host in "${ALL_HOSTS[@]}"; do
                 if [[ -z "${INSTALL_LLBUILD}" ]] ; then
                     continue
                 fi
-                INSTALL_TARGETS="install-swift-build-tool install-libllbuildSwift"
+                INSTALL_TARGETS="install-libllbuildSwift"
+                # Remove most libdispatch products before building the package manager.
+                rm -rf @TERMUX_PREFIX@/lib/swift{,_static}/{Block,os}
+                rm @TERMUX_PREFIX@/lib/swift{,_static}/dispatch/*.h
+                sed -i -e "s%dispatch\.h%@TERMUX_PREFIX@/include/dispatch/dispatch.h%" \
+                -e "s%introspection\.h%@TERMUX_PREFIX@/include/dispatch/introspection.h%" \
+                @TERMUX_PREFIX@/lib/swift/dispatch/module.modulemap
+                sed -i -e "s%dispatch\.h%@TERMUX_PREFIX@/include/dispatch/dispatch.h%" \
+                -e "s%introspection\.h%@TERMUX_PREFIX@/include/dispatch/introspection.h%" \
+                @TERMUX_PREFIX@/lib/swift_static/dispatch/module.modulemap
+                if [[ -z "${ANDROID_DATA}" ]] ; then
+                    mv @TERMUX_PREFIX@/lib/swift/${host/-//}/glibc.modulemap @TERMUX_PREFIX@/glibc-native.modulemap
+                    cp $(build_directory ${host} swift)/lib/swift/${host/-//}/glibc.modulemap @TERMUX_PREFIX@/lib/swift/${host/-//}/glibc.modulemap
+                fi
                 ;;
             # Products from this here install themselves; they don't fall-through.
             lldb)
                 if [[ -z "${INSTALL_LLDB}" ]] ; then