diff --git a/x11-packages/fluxbox/build.sh b/x11-packages/fluxbox/build.sh
index daae71db5..866003e21 100644
--- a/x11-packages/fluxbox/build.sh
+++ b/x11-packages/fluxbox/build.sh
@@ -7,12 +7,15 @@ TERMUX_PKG_REVISION=4
 TERMUX_PKG_SRCURL=https://downloads.sourceforge.net/sourceforge/fluxbox/fluxbox-${TERMUX_PKG_VERSION}.tar.xz
 TERMUX_PKG_SHA256=fc8c75fe94c54ed5a5dd3fd4a752109f8949d6df67a48e5b11a261403c382ec0
 TERMUX_PKG_DEPENDS="feh, fribidi, imlib2, libandroid-support, libc++, libxft, libxinerama, libxpm, libxrandr, xorg-xmessage"
+TERMUX_PKG_BUILD_IN_SRC=true
 
 TERMUX_PKG_EXTRA_CONFIGURE_ARGS="
 --enable-imlib2
 --enable-xft
 --enable-xinerama
-CFLAGS=-I${TERMUX_PREFIX}/include/libandroid-support
 "
 
-TERMUX_PKG_BUILD_IN_SRC=true
+termux_step_pre_configure() {
+    export CFLAGS="${CFLAGS} -I${TERMUX_PREFIX}/include/libandroid-support"
+    export CXXFLAGS="${CXXFLAGS} -Wno-c++11-narrowing"
+}