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-rw-r--r--lib/spack/spack/build_environment.py6
1 files changed, 3 insertions, 3 deletions
diff --git a/lib/spack/spack/build_environment.py b/lib/spack/spack/build_environment.py
index 849ee0b15c..af3329ed56 100644
--- a/lib/spack/spack/build_environment.py
+++ b/lib/spack/spack/build_environment.py
@@ -191,9 +191,9 @@ def set_build_environment_variables(pkg, env, dirty):
dirty (bool): Skip unsetting the user's environment settings
"""
# Gather information about various types of dependencies
- build_deps = pkg.spec.dependencies(deptype=('build', 'test'))
- link_deps = pkg.spec.traverse(root=False, deptype=('link'))
- build_link_deps = list(build_deps) + list(link_deps)
+ build_deps = set(pkg.spec.dependencies(deptype=('build', 'test')))
+ link_deps = set(pkg.spec.traverse(root=False, deptype=('link')))
+ build_link_deps = build_deps | link_deps
rpath_deps = get_rpath_deps(pkg)
build_prefixes = [dep.prefix for dep in build_deps]