From 9f0e17a5389e6e09d0198785241ff5d98b42498d Mon Sep 17 00:00:00 2001
From: Michael Kuhn <suraia@ikkoku.de>
Date: Sat, 20 Jan 2018 21:36:45 +0100
Subject: [PATCH] flex: restrict GCC conflict to newer Ubuntu releases (#6963)

flex 2.6.4 compiles fine with GCC 7 on (at least) Ubuntu 16.04 and Fedora 27.
---
 var/spack/repos/builtin/packages/flex/package.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/var/spack/repos/builtin/packages/flex/package.py b/var/spack/repos/builtin/packages/flex/package.py
index a4a9718e04..25e895d921 100644
--- a/var/spack/repos/builtin/packages/flex/package.py
+++ b/var/spack/repos/builtin/packages/flex/package.py
@@ -53,9 +53,9 @@ class Flex(AutotoolsPackage):
     depends_on('automake', type='build', when='@:2.6.0')
     depends_on('libtool',  type='build', when='@:2.6.0')
 
-    # Build issue for v2.6.4 when gcc 7.2.0 is used.
+    # Build issue for v2.6.4 when gcc 7.2.0 is used on Ubuntu 17.10.
     # See issue #219; https://github.com/westes/flex/issues/219
-    conflicts('%gcc@7.2.0:', when='@2.6.4')
+    conflicts('%gcc@7.2.0: os=ubuntu17.10', when='@2.6.4')
 
     def url_for_version(self, version):
         url = "https://github.com/westes/flex"
-- 
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