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-rw-r--r--Build/source/m4/kpse-common.m42
1 files changed, 2 insertions, 0 deletions
diff --git a/Build/source/m4/kpse-common.m4 b/Build/source/m4/kpse-common.m4
index 2345634835a..859892ff166 100644
--- a/Build/source/m4/kpse-common.m4
+++ b/Build/source/m4/kpse-common.m4
@@ -245,6 +245,8 @@ AC_CACHE_CHECK([whether the compiler accepts prototypes],
if test "$kb_cv_c_prototypes" = yes; then
AC_DEFINE([HAVE_PROTOTYPES], 1,
[Define to 1 if your compiler understands prototypes.])
+else
+ AC_MSG_ERROR([Sorry, your compiler does not understand prototypes.])
fi
dnl
dnl This is a GNU libc invention.