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-rw-r--r--Build/source/utils/xindy/configure.ac2
1 files changed, 1 insertions, 1 deletions
diff --git a/Build/source/utils/xindy/configure.ac b/Build/source/utils/xindy/configure.ac
index 530a6397448..d9b23d6a692 100644
--- a/Build/source/utils/xindy/configure.ac
+++ b/Build/source/utils/xindy/configure.ac
@@ -111,7 +111,7 @@ AC_SUBST(LISP_RUN)
# Checks for header files.
AC_HEADER_STDC
-AC_CHECK_HEADERS([stdlib.h string.h])
+AC_CHECK_HEADERS([stdlib.h string.h regex.h],[],[AC_MSG_ERROR([required C header file is missing])])
dnl check system type
AC_CANONICAL_HOST