Adding the directory containing 'config.py' in to the sys.path variable,

so that - when config.py refered from outside the pgAdmin itself (i.e.
during building the pip).

web/config.py

@@ -12,6 +12,15 @@
 ##########################################################################
 
 import os
+import sys
+
+
+# We need to include the root directory in sys.path to ensure that we can
+# find everything we need when running in the standalone runtime.
+root = os.path.dirname(os.path.realpath(__file__))
+if sys.path[0] != root:
+    sys.path.insert(0, root)
+
 from pgadmin.utils import env, IS_PY2, IS_WIN, fs_short_path
 
 ##########################################################################