GNOME's libmsi.so
source code from msitools repository.
I don't know could it be even compiled or not.
gcc -c -fPIC libmsi/*.c `pkg-config --cflags glib-2.0` `pkg-config --libs glib-2.0` -I`pwd`/include `pkg-config --cflags libgsf-1`
gcc *.o -shared -o msilib.so