1 files changed, 14 insertions, 2 deletions

diff --git a/src/mailman/config/config.py b/src/mailman/config/config.py
index d23bdda13..e9da7ae4f 100644
--- a/src/mailman/config/config.py
+++ b/src/mailman/config/config.py
@@ -134,8 +134,20 @@ class Configuration:
 
     def _expand_paths(self):
         """Expand all configuration paths."""
-        # Set up directories.
-        bin_dir = os.path.abspath(os.path.dirname(sys.executable))
+        # First we need to locate the bin directory.  This can differ in
+        # several cases, such as, if we're installing into a virtual
+        # environment, /usr/bin, /usr/local/bin, or running the test suite.
+        # We'll try some common locations, looking for a landmark.  First
+        # location wins.
+        for origin in (sys.executable, sys.argv[0]):
+            bin_dir = os.path.abspath(os.path.dirname(origin))
+            # Search for 'master' in this directory, since that's the thing we
+            # actually need to be able to run.
+            if os.path.exists(os.path.join(bin_dir, 'master')):
+                break
+        else:
+            print("Could not find the 'master' script", file=sys.stderr)
+            sys.exit(1)
         # Now that we've loaded all the configuration files we're going to
         # load, set up some useful directories based on the settings in the
         # configuration file.