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-rw-r--r--src/cmd/troff/n7.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/cmd/troff/n7.c b/src/cmd/troff/n7.c
index bcea354a..17ab2bd5 100644
--- a/src/cmd/troff/n7.c
+++ b/src/cmd/troff/n7.c
@@ -1,3 +1,4 @@
+#define _BSD_SOURCE 1 /* isascii */
#include "tdef.h"
#include "fns.h"
#include "ext.h"