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-rw-r--r--m4/strerror_r.m41
1 files changed, 1 insertions, 0 deletions
diff --git a/m4/strerror_r.m4 b/m4/strerror_r.m4
index 1e57f27c8..72c75515c 100644
--- a/m4/strerror_r.m4
+++ b/m4/strerror_r.m4
@@ -42,6 +42,7 @@ if test $ac_cv_func_strerror_r = yes; then
[
# include <stdio.h>
# include <string.h>
+# include <ctype.h>
extern char *strerror_r ();