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-rw-r--r--var/spack/repos/builtin/packages/r-sys/package.py5
1 files changed, 5 insertions, 0 deletions
diff --git a/var/spack/repos/builtin/packages/r-sys/package.py b/var/spack/repos/builtin/packages/r-sys/package.py
index bd9aff9519..1901e54354 100644
--- a/var/spack/repos/builtin/packages/r-sys/package.py
+++ b/var/spack/repos/builtin/packages/r-sys/package.py
@@ -18,3 +18,8 @@ class RSys(RPackage):
list_url = "https://cloud.r-project.org/src/contrib/Archive/sys"
version('3.2', sha256='2819498461fe2ce83d319d1a47844e86bcea6d01d10861818dba289e7099bbcc')
+
+ def flag_handler(self, name, flags):
+ if name == 'cflags':
+ flags.append(self.compiler.c99_flag)
+ return (flags, None, None)