Я не вижу файл "build-all-xml", а в файле "buildall-with-xml" по libgc написано следующее:

Aleksey 03.04.2006 14:53

...

if test ! -f "$project_directory/gc/lib/libgc.a"; then
cd $project_directory/src
echo "Downloading libgc [1 lib of 3]..."
wget -c http://www.hpl.hp.com/personal/Hans_Boehm/gc/gc_source/gc6.6.tar.gz
echo "Unpacking..."
gunzip -c gc6.6.tar.gz | tar vxf - >/dev/null
cd gc6.6
echo "Configuring libgc..."
CPPFLAGS="-DUSE_LIBC_PRIVATES -DUSE_MMAP -DUSE_MUNMAP" \
./configure --prefix=$project_directory/gc --disable-threads --disable-shared --silent
echo "Building libgc..."
make
make install
fi

...

---