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-rw-r--r--lib/spack/spack/package.py4
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/spack/spack/package.py b/lib/spack/spack/package.py
index b488e4c49d..dafad0b184 100644
--- a/lib/spack/spack/package.py
+++ b/lib/spack/spack/package.py
@@ -1351,6 +1351,10 @@ class InstallError(spack.error.SpackError):
super(InstallError, self).__init__(message, long_msg)
+class ExternalPackageError(InstallError):
+ """Raised by install() when a package is only for external use."""
+
+
class PackageStillNeededError(InstallError):
"""Raised when package is still needed by another on uninstall."""
def __init__(self, spec, dependents):