From d8c333ecf179b652eaabf71a512aebc1864f6bf7 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Tue, 17 May 2022 10:31:49 +0200
Subject: Use posix_spawn() on OpenBSD 5.2 or later

---
 libbutl/process.cxx | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/libbutl/process.cxx b/libbutl/process.cxx
index 5523b96..a19719f 100644
--- a/libbutl/process.cxx
+++ b/libbutl/process.cxx
@@ -47,6 +47,14 @@
 #  elif defined(__NetBSD__) && __NetBSD__ >= 6
 #    define LIBBUTL_POSIX_SPAWN
 //
+// On OpenBSD posix_spawn() appeared in 5.2 (see the man page for details).
+//
+#  elif defined(__OpenBSD__)
+#    include <sys/param.h> // OpenBSD (yyyymm)
+#    if OpenBSD >= 201211  // 5.2 released on 1 Nov 2012.
+#      define LIBBUTL_POSIX_SPAWN
+#    endif
+//
 // posix_spawn() appeared in Version 3 of the Single UNIX Specification that
 // was implemented in MacOS 10.5 (see the man page for details).
 //
-- 
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