From 7ef95767eef03a8498ed1a24659b9e5b52856f01 Mon Sep 17 00:00:00 2001
From: Joschka Lingemann <jlingema@users.noreply.github.com>
Date: Fri, 3 Mar 2017 23:30:32 +0100
Subject: [PATCH] Fix error raised for multiple virtual packages. (#3306)

---
 lib/spack/spack/package_prefs.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/spack/spack/package_prefs.py b/lib/spack/spack/package_prefs.py
index 190647bb81..63f90d9b50 100644
--- a/lib/spack/spack/package_prefs.py
+++ b/lib/spack/spack/package_prefs.py
@@ -43,7 +43,8 @@ def get_packages_config():
     if virtuals:
         errors = ["%s: %s" % (line_info, name) for name, line_info in virtuals]
         raise VirtualInPackagesYAMLError(
-            "packages.yaml entries cannot be virtual packages:", *errors)
+            "packages.yaml entries cannot be virtual packages:",
+            '\n'.join(errors))
 
     return config