1 files changed, 1 insertions, 1 deletions
diff --git a/src/cmd/rc/io.h b/src/cmd/rc/io.h
index 6c75cc5b..c970132f 100644
--- a/src/cmd/rc/io.h
+++ b/src/cmd/rc/io.h
@@ -10,7 +10,7 @@ struct io{
 	int fd;
 	char *bufp, *ebuf, *strp, buf[NBUF];
 };
-io *err;
+extern io *err;
 io *openfd(int), *openstr(void), *opencore(char *, int);
 int emptybuf(io*);
 void pchr(io*, int);