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--- a/ForgeSVN/setup.py
+++ b/ForgeSVN/setup.py
@@ -2,6 +2,15 @@
 import sys, os
 
 from forgesvn.version import __version__
+
+# "install_requires" can't be safely used with pysvn since pysvn is packaged
+# strangely and is not always known to packaging tools (setup.py, pip) even
+# when it is installed and can be imported and used
+try:
+    import pysvn
+except ImportError:
+    print '\npysvn must be installed for ForgeSVN to work\n'
+    raise
 
 setup(name='ForgeSVN',
       version=__version__,