#include <X11/Xlib.h>
main() {
    XModifierKeymap *xmkm;
    xmkm=XNewModifiermap(1);
    return xmkm==NULL;
}
        ],[x11_works=yes])
        AC_MSG_RESULT($x11_works)
    fi
    LDFLAGS="$PRELDFLAGS"
    CPPFLAGS="$PRECPPFLAGS"

    dnl figure out whether we need to build against X11
    if test "x$bc_with_x11" != "xno" ; then