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-rw-r--r--xdiff/xinclude.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/xdiff/xinclude.h b/xdiff/xinclude.h
index 9490fc5..04a9da8 100644
--- a/xdiff/xinclude.h
+++ b/xdiff/xinclude.h
@@ -23,6 +23,7 @@
#if !defined(XINCLUDE_H)
#define XINCLUDE_H
+#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>