diff --git a/pyan/main.py b/pyan/main.py
index e78e17c..7c7e275 100644
--- a/pyan/main.py
+++ b/pyan/main.py
@@ -80,6 +80,8 @@ def main():
     filenames = [fn2 for fn in args for fn2 in glob(fn)]
     if len(args) == 0:
         parser.error('Need one or more filenames to process')
+    if len(args) > 0 and len(filenames) == 0:
+        parser.error('No files found matching given glob: %s' % ' '.join(args))
 
     if options.nested_groups:
         options.grouped = True
diff --git a/setup.py b/setup.py
index d943c60..4963622 100644
--- a/setup.py
+++ b/setup.py
@@ -136,7 +136,7 @@ setup(
     # See
     #    http://setuptools.readthedocs.io/en/latest/setuptools.html
     #
-    setup_requires=[],
+    setup_requires=["wheel"],
     install_requires=[],
     provides=["pyan"],
 
diff --git a/visualize_pyan_architecture.sh b/visualize_pyan_architecture.sh
index 22c6334..36ed24f 100755
--- a/visualize_pyan_architecture.sh
+++ b/visualize_pyan_architecture.sh
@@ -1,4 +1,4 @@
 #!/bin/bash
 echo -ne "Pyan architecture: generating architecture.{dot,svg}\n"
 python3 -m pyan pyan/*.py --no-defines --uses --colored --annotate --dot -V >architecture.dot 2>architecture.log
-dot -Tsvg architecture.dot >architecture.svg
+dot -Tsvg architecture.dot >architecture.svg
\ No newline at end of file