>From 6608c7ce9057a9bc38df723b38523aad5c05d41e Mon Sep 17 00:00:00 2001
From: Jesse Gibbons <jgibbons2357+guix@gmail.com>
Date: Sun, 5 Apr 2020 20:47:02 -0600
Subject: [PATCH 1/1] gnu: knights: Fix build.

* gnu/packages/games.scm (knights):
[make-flags] add "CXXFLAGS=-lpthread"
---
 gnu/packages/games.scm | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/gnu/packages/games.scm b/gnu/packages/games.scm
index cff1c0af99..dc0511e55a 100644
--- a/gnu/packages/games.scm
+++ b/gnu/packages/games.scm
@@ -1366,7 +1366,8 @@ built-in level editor.")
     (build-system gnu-build-system)
     (arguments
      '(#:make-flags
-       (list (string-append "PREFIX=" (assoc-ref %outputs "out")))
+       (list (string-append "PREFIX=" (assoc-ref %outputs "out"))
+	     "CXXFLAGS=-lpthread")
        #:phases
        (modify-phases %standard-phases
          ;; No configure script.
-- 
2.27.0