From 2f6556ea825c8f89919c011e584ee45f842f8ee2 Mon Sep 17 00:00:00 2001
From: Paul Ferrell <51765748+Paul-Ferrell@users.noreply.github.com>
Date: Wed, 4 May 2022 06:21:25 -0600
Subject: mesa: intel needs c99 standard specified under intel. (#30334)

---
 var/spack/repos/builtin/packages/mesa/package.py | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/var/spack/repos/builtin/packages/mesa/package.py b/var/spack/repos/builtin/packages/mesa/package.py
index 02930274d5..2d10baab56 100644
--- a/var/spack/repos/builtin/packages/mesa/package.py
+++ b/var/spack/repos/builtin/packages/mesa/package.py
@@ -135,6 +135,12 @@ class Mesa(MesonPackage):
             "_llvm_method = 'config-tool'",
             "meson.build")
 
+    def flag_handler(self, name, flags):
+        if self.spec.satisfies('%intel'):
+            if name == 'cflags':
+                flags.append('-std=c99')
+        return super(Mesa, self).flag_handler(name, flags)
+
     def meson_args(self):
         spec = self.spec
         args = [
-- 
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