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-rw-r--r--var/spack/repos/builtin/packages/amber/package.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/var/spack/repos/builtin/packages/amber/package.py b/var/spack/repos/builtin/packages/amber/package.py
index 88c830977a..f72ce9bc4d 100644
--- a/var/spack/repos/builtin/packages/amber/package.py
+++ b/var/spack/repos/builtin/packages/amber/package.py
@@ -143,6 +143,7 @@ class Amber(Package, CudaPackage):
depends_on("cuda@7.5.18", when="@:16+cuda")
# conflicts
+ conflicts("+x11", when="platform=cray", msg="x11 amber applications not available for cray")
conflicts("+openmp", when="%clang", msg="OpenMP not available for the clang compiler")
conflicts(
"+openmp", when="%apple-clang", msg="OpenMP not available for the Apple clang compiler"