dnl AC_CONFIG_SUBDIRS does not allow configure options to be passed
dnl to subdirs, this function allows that by creating a configure.gnu
dnl script that prepends configure options and then calls the real
dnl configure script
AC_DEFUN([AX_CONFIG_SUBDIR_OPTION],
[
AC_CONFIG_SUBDIRS([$1])

m4_ifblank([$2], [rm -f $srcdir/$1/configure.gnu],
[echo -e '#!/bin/sh\nexec "`dirname "'\$'0"`/configure" '"$2"' "'\$'@"' > "$srcdir/$1/configure.gnu"
])
])