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-rw-r--r--usr.bin/m4/extern.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/usr.bin/m4/extern.h b/usr.bin/m4/extern.h
index 88cba41..e96870b 100644
--- a/usr.bin/m4/extern.h
+++ b/usr.bin/m4/extern.h
@@ -149,7 +149,7 @@ extern char ecommt[MAXCCHARS+1];/* end character for comment */
extern char *ep; /* first free char in strspace */
extern char lquote[MAXCCHARS+1];/* left quote character (`) */
extern const char *m4wraps; /* m4wrap string default. */
-extern const char *null; /* as it says.. just a null. */
+extern char null[]; /* as it says.. just a null. */
extern char rquote[MAXCCHARS+1];/* right quote character (') */
extern char scommt[MAXCCHARS+1];/* start character for comment */
extern int synccpp; /* Line synchronisation for C preprocessor */
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