diff -ru -x '*.Po' -x '*.Plo' -x '*.lo' -x '*.la' -x '*.o' glib-2.28.6.orig/acinclude.m4 glib-2.28.6/acinclude.m4
--- glib-2.28.6.orig/acinclude.m4	2011-06-09 14:05:51 +0200
+++ glib-2.28.6/acinclude.m4	2011-06-10 08:25:58 +0200
@@ -254,9 +254,13 @@
 
 AC_DEFUN([gt_TYPE_LONGDOUBLE],
 [
+  AC_REQUIRE([AC_CANONICAL_HOST])
   AC_CACHE_CHECK([for long double], gt_cv_c_long_double,
     [if test "$GCC" = yes; then
-       gt_cv_c_long_double=yes
+       case "$host" in
+       *-interix*) gt_cv_c_long_double=no ;;
+       *) gt_cv_c_long_double=yes ;;
+	   esac
      else
        AC_TRY_COMPILE([
          /* The Stardent Vistra knows sizeof(long double), but does not support it.  */