From cf61e1e5641b19027f71cfd945ea0d9ab4d1a4bc Mon Sep 17 00:00:00 2001
From: Holger Vogt <holger.vogt@uni-due.de>
Date: Mon, 25 May 2020 09:18:35 +0200
Subject: [PATCH] add missing header

---
 src/spicelib/analysis/optran.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/spicelib/analysis/optran.c b/src/spicelib/analysis/optran.c
index 7986fecb9..60d30acdf 100644
--- a/src/spicelib/analysis/optran.c
+++ b/src/spicelib/analysis/optran.c
@@ -6,6 +6,8 @@ Modified BSD license
 
 /* subroutine to generate OP by TRANSIENT analysis */
 
+#include <errno.h>
+
 #include "ngspice/ngspice.h"
 #include "ngspice/cktdefs.h"
 #include "cktaccept.h"