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-rw-r--r--Build/source/m4/kpse-common.m43
1 files changed, 3 insertions, 0 deletions
diff --git a/Build/source/m4/kpse-common.m4 b/Build/source/m4/kpse-common.m4
index 9c98f349e8c..c1f193d850d 100644
--- a/Build/source/m4/kpse-common.m4
+++ b/Build/source/m4/kpse-common.m4
@@ -261,6 +261,9 @@ AC_TYPE_UINT64_T
AS_CASE([:$ac_cv_c_int64_t:$ac_cv_c_int64_t:],
[*':no:'*], [AC_MSG_ERROR([Sorry, your compiler does not support 64-bit integer types.])])
dnl
+dnl Check if <ctype.h> declares isascii.
+AC_CHECK_DECLS([isascii], [], [], [[#include <ctype.h>]])
+dnl
dnl Check whether struct stat provides high-res time.
AC_CHECK_MEMBERS([struct stat.st_mtim])
]) # KPSE_COMMON