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-rw-r--r--src/file_pnm.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/file_pnm.c b/src/file_pnm.c
index 066c37c..612aa56 100644
--- a/src/file_pnm.c
+++ b/src/file_pnm.c
@@ -27,6 +27,7 @@
#include <string.h>
#endif
#include <stdio.h>
+#include <ctype.h>
#include "types.h"
#include "filegen.h"