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-rw-r--r--lib/spack/spack/preferred_packages.py4
1 files changed, 2 insertions, 2 deletions
diff --git a/lib/spack/spack/preferred_packages.py b/lib/spack/spack/preferred_packages.py
index 5f18e212b6..f079c1ef8b 100644
--- a/lib/spack/spack/preferred_packages.py
+++ b/lib/spack/spack/preferred_packages.py
@@ -162,8 +162,8 @@ class PreferredPackages(object):
"""Return a VariantMap of preferred variants and their values"""
variants = self.preferred.get(pkgname, {}).get('variants', '')
if not isinstance(variants, basestring):
- variants = "".join(variants)
- return spack.spec.Spec(pkgname + variants).variants
+ variants = " ".join(variants)
+ return spack.spec.Spec("%s %s" % (pkgname, variants)).variants
def version_compare(self, pkgname, a, b):
"""Return less-than-0, 0, or greater than 0 if version a of pkgname is