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-rw-r--r--lib/spack/spack/directives.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/spack/spack/directives.py b/lib/spack/spack/directives.py
index 35f27b7a26..18462fb726 100644
--- a/lib/spack/spack/directives.py
+++ b/lib/spack/spack/directives.py
@@ -97,7 +97,7 @@ Patcher = Callable[[Union["spack.package_base.PackageBase", Dependency]], None]
PatchesType = Optional[Union[Patcher, str, List[Union[Patcher, str]]]]
-SUPPORTED_LANGUAGES = ("fortran", "cxx")
+SUPPORTED_LANGUAGES = ("fortran", "cxx", "c")
def _make_when_spec(value: WhenType) -> Optional["spack.spec.Spec"]: