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-rw-r--r--bsd-base64.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/bsd-base64.c b/bsd-base64.c
index 3ff88abe..9583c669 100644
--- a/bsd-base64.c
+++ b/bsd-base64.c
@@ -42,6 +42,7 @@
*/
#include <stdlib.h>
+#include <ctype.h>
#include "gpsd_config.h"
#if !defined(HAVE_B64_NTOP) && !defined(HAVE___B64_NTOP)