Conditionally include err.h.

diff --git a/regress/modpipe.c b/regress/modpipe.c
index c43e9cba19bee50800db84f47a6a3ca8e83429d4..5f4824b51d024df7d31da0f51fcf9799dee887e6 100755 (executable)
--- a/regress/modpipe.c
+++ b/regress/modpipe.c
@@ -25,6 +25,9 @@
 #include <stdarg.h>
 #include <stdlib.h>
 #include <errno.h>
+#ifdef HAVE_ERR_H
+# include <err.h>
+#endif
 #include "openbsd-compat/getopt_long.c"
 
 static void