From 0b95f51eae50fbe627a354f50fa053a6d52b81aa Mon Sep 17 00:00:00 2001
From: Marius Bakke <marius@gnu.org>
Date: Fri, 24 Jul 2020 12:11:42 +0200
Subject: gnu: enigma: Fix build with GCC >= 6.

* gnu/packages/games.scm (enigma)[arguments]: Add phase to substitute faulty
comparison.
---
 gnu/packages/games.scm | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/gnu/packages/games.scm b/gnu/packages/games.scm
index 556f813396..213acc6b9f 100644
--- a/gnu/packages/games.scm
+++ b/gnu/packages/games.scm
@@ -5841,6 +5841,14 @@ (define-public enigma
        (list "--with-system-enet")
        #:phases
        (modify-phases %standard-phases
+         (add-after 'unpack 'fix-build-with-new-gcc
+           (lambda _
+             ;; Fix build with GCC6 and later by avoiding comparing ifstream
+             ;; to NULL.  Can be removed for versions > 1.21.
+             (substitute* "src/lev/Proxy.cc"
+               (("ifs != NULL")
+                "ifs"))
+             #t))
          (add-after 'unpack 'find-sdl
            (lambda _
              (substitute* "configure"
-- 
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