From 2194be6c9259f79b97131cec8ae44e1180b4f309 Mon Sep 17 00:00:00 2001
From: Pino Toscano <toscano.pino@tiscali.it>
Date: Sat, 6 Jun 2026 22:25:09 +0200
Subject: [PATCH] asn1: Include <errno.h> before using/checking bits from it

Commit 232c936ea3eabfd702aaaa106ddf9474f231d776 added a fallback ENOTSUP
definition. The check itself and the fallback definition rely on
<errno.h> to be included already, so in case it was not (depending on
the platform) then there will be a wrong definition of ENOTSUP.

Instead of rely on <errno.h> to be included before including a
generated header from this tool, include it manually. This way both
the ENOTSUP check and its fallback definition (if ever) will always
work.
---
 lib/asn1/gen.c      | 1 +
 lib/asn1/template.c | 1 +
 2 files changed, 2 insertions(+)

diff --git a/lib/asn1/gen.c b/lib/asn1/gen.c
index e3da98e5c..849e38c09 100644
--- a/lib/asn1/gen.c
+++ b/lib/asn1/gen.c
@@ -191,6 +191,7 @@ init_generate (const char *filename, const char *base)
     fprintf (headerfile,
 	     "#include <stddef.h>\n"
 	     "#include <stdint.h>\n"
+	     "#include <errno.h>\n"
 	     "#include <time.h>\n\n");
     fprintf (headerfile,
 	     "#ifndef __asn1_common_definitions__\n"
diff --git a/lib/asn1/template.c b/lib/asn1/template.c
index 784bfdbc6..42f5c9e6d 100644
--- a/lib/asn1/template.c
+++ b/lib/asn1/template.c
@@ -38,6 +38,7 @@
 #include <vis.h>
 #include <vis-extras.h>
 #include <heimbase.h>
+#include <errno.h>
 
 #ifndef ENOTSUP
 /* Very old MSVC CRTs don't have ENOTSUP */