Removing -I/usr/include in Android build

Hi, I'm trying to compile Boost for Android, this is the code that I'm using.

./bootstrap.sh -with-toolset=gcc

userConfigs=$srcdir/$_srcname/user-config.jam

cat << EOF > "${userConfigs}"
using clang : android : ${ANDROID_CXX} :
<archiver>${ANDROID_AR} \
<assembler>${ANDROID_AS}
;
EOF

./b2 install \
    --prefix="$srcdir/fakeinstall" \
    --user-config="${userConfigs}" \
    --layout=system \
    --with-atomic \
    --with-chrono \
    --with-container \
    --with-date_time \
    --with-exception \
    --with-fiber \
    --with-filesystem \
    --with-graph \
    --with-graph_parallel \
    --with-iostreams \
    --with-locale \
    --with-log \
    --with-math \
    --with-mpi \
    --with-program_options \
    --with-random \
    --with-regex \
    --with-serialization \
    --with-system \
    --with-test \
    --with-thread \
    --with-timer \
    --with-type_erasure \
    --with-wave \
    --with-stacktrace \
    -sICONV_PATH="${ANDROID_PREFIX}" \
    variant=release \
    debug-symbols=off \
    runtime-link=shared \
    link=shared,static \
    target-os=android \
    toolset=clang-android \
    architecture=arm \
    threading=multi \
    address-model=64 \
    cflags="-I${ANDROIND_PREFIX_INCLUDE}" \
    cxxflags="-I${ANDROIND_PREFIX_INCLUDE}" \
    linkflags="-L${ANDROIND_PREFIX_LIB}"

The build fails and this command popup (over many other error messages).

"/opt/android-ndk/toolchains/llvm/prebuilt/linux-x86_64/bin/aarch64-linux-android24-clang++"   -I/opt/android-libs/aarch64/include  -DBOOST_ALL_NO_LIB=1 -DBOOST_COBALT_USE_STD_PMR=1 -DBOOST_MPI_DYN_LINK=1 -DBOOST_MPI_SOURCE=1 -DNDEBUG   -I"." -I"/usr/include"  -c -o "bin.v2/libs/mpi/build/clang-linux-android/release/local-visibility-global/target-os-android/threading-multi/visibility-hidden/cartesian_communicator.o" "libs/mpi/src/cartesian_communicator.cpp"

With this error message:

In file included from libs/mpi/src/cartesian_communicator.cpp:9:
In file included from /opt/android-ndk/toolchains/llvm/prebuilt/linux-x86_64/bin/../sysroot/usr/include/c++/v1/algorithm:1710:
In file included from /opt/android-ndk/toolchains/llvm/prebuilt/linux-x86_64/bin/../sysroot/usr/include/c++/v1/type_traits:538:
/opt/android-ndk/toolchains/llvm/prebuilt/linux-x86_64/bin/../sysroot/usr/include/c++/v1/cstdint:149:5: error: <cstdint> tried including <stdint.h> but didn't find libc++'s <stdint.h> header.           This usually means that your header search paths are not configured properly.           The header search paths should contain the C++ Standard Library headers before           any C Standard Library, and you are probably using compiler flags that make that           not be the case.
#   error <cstdint> tried including <stdint.h> but didn't find libc++'s <stdint.h> header. \
    ^

And have found that removing the -I"/usr/include" flag and executing that command directly it compiles fine. The problem is that I have not found where that flag was introduced. Did tried grepping for -I.*/include and /usr/include and other similar expressions but did not found any meaningful result. I'm trying to compile Boost 1.84.0.

boostorg / boost

Removing -I/usr/include in Android build #869