Cthulhu should now work no matter where it gets installed.

src/cthulhu.py

@@ -48,12 +48,32 @@ def setup_paths():
         if currentDir.startswith(os.path.expanduser('~/.local')):
             # Local installation (~/.local/bin/cthulhu)
             prefix = os.path.expanduser('~/.local')
-            pythondir = os.path.join(prefix, 'lib', f'python{sys.version_info.major}.{sys.version_info.minor}', 'site-packages')
+        elif currentDir.startswith('/usr/local'):
-            datadir = os.path.join(prefix, 'share', 'cthulhu')
+            # /usr/local installation
+            prefix = '/usr/local'
         else:
             # System installation (/usr/bin/cthulhu)
             prefix = '/usr'
-            pythondir = os.path.join(prefix, 'lib', f'python{sys.version_info.major}.{sys.version_info.minor}', 'site-packages')
+            
+        # Try to find Python modules in multiple possible locations
+        python_version = f'python{sys.version_info.major}.{sys.version_info.minor}'
+        possible_pythondirs = [
+            os.path.join(prefix, 'lib', python_version, 'site-packages'),
+            os.path.join('/usr', 'lib', python_version, 'site-packages'),  # System fallback
+            os.path.join('/usr/local', 'lib', python_version, 'site-packages')  # /usr/local fallback
+        ]
+        
+        # Use the first directory that contains the cthulhu module
+        pythondir = None
+        for candidate_dir in possible_pythondirs:
+            if os.path.exists(os.path.join(candidate_dir, 'cthulhu', '__init__.py')):
+                pythondir = candidate_dir
+                break
+                
+        if pythondir is None:
+            # Fallback to prefix-relative path if module not found
+            pythondir = os.path.join(prefix, 'lib', python_version, 'site-packages')
+            
         datadir = os.path.join(prefix, 'share', 'cthulhu')
     
     sys.path.insert(1, pythondir)