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-rw-r--r--var/spack/repos/builtin/packages/mpich/package.py3
1 files changed, 3 insertions, 0 deletions
diff --git a/var/spack/repos/builtin/packages/mpich/package.py b/var/spack/repos/builtin/packages/mpich/package.py
index 8965c3d711..44c94a6d8f 100644
--- a/var/spack/repos/builtin/packages/mpich/package.py
+++ b/var/spack/repos/builtin/packages/mpich/package.py
@@ -187,6 +187,9 @@ spack package at this time.''',
conflicts('+pci', when='@:3.2~hydra')
conflicts('+libxml2', when='@:3.2~hydra')
+ # see https://github.com/pmodels/mpich/pull/5031
+ conflicts('%clang@:7', when='@3.4:')
+
@classmethod
def determine_version(cls, exe):
output = Executable(exe)(output=str, error=str)