Just install the supplied man file.

Index: setup.py
--- setup.py.orig
+++ setup.py
@@ -32,9 +32,8 @@ with open('README.rst', encoding='utf-8') as f:
 
 def get_data_files():
     data_files = [
-        ('share/doc/glances', ['AUTHORS', 'COPYING', 'NEWS.rst', 'README.rst',
-                               'CONTRIBUTING.md', 'conf/glances.conf']),
-        ('share/man/man1', ['docs/man/glances.1'])
+        ('share/examples/glances', ['conf/glances.conf']),
+        ('man/man1', ['docs/man/glances.1'])
     ]
 
     return data_files