From 18caa6f528b09d63ac26ba53f78e4c35fed5b317 Mon Sep 17 00:00:00 2001
From: Marius Bakke <mbakke@fastmail.com>
Date: Fri, 3 Apr 2020 18:18:54 +0200
Subject: gnu: hyperrogue: Fix build failure.

* gnu/packages/games.scm (hyperrogue)[arguments]: Do not assume CPATH is set.
---
 gnu/packages/games.scm | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'gnu/packages/games.scm')

diff --git a/gnu/packages/games.scm b/gnu/packages/games.scm
index 7555a0d800..f0f1886952 100644
--- a/gnu/packages/games.scm
+++ b/gnu/packages/games.scm
@@ -4226,7 +4226,7 @@ throwing people around in pseudo-randomly generated buildings.")
          (add-after 'set-paths 'set-sdl-paths
            (lambda* (#:key inputs #:allow-other-keys)
              (setenv "CPATH"
-                     (string-append (getenv "CPATH") ":"
+                     (string-append (or (getenv "CPATH") "") ":"
                                     (assoc-ref inputs "sdl-union")
                                     "/include/SDL"))))
          (replace 'configure
-- 
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