xiaolanpython
diff --git a/‎setup.py‎
Lines changed: 5 additions & 4 deletions b/‎setup.py‎
Lines changed: 5 additions & 4 deletions
@@ -372,10 +372,11 @@ def detect_modules(self):
                                       '/usr/contrib/ssl/lib/'
                                      ] )
 
-        krb5_h = find_file('krb5.h', inc_dirs,
-                           ['/usr/kerberos/include'])
-        if krb5_h:
-            ssl_incs += krb5_h
+        if ssl_incs is not None:
+            krb5_h = find_file('krb5.h', inc_dirs,
+                               ['/usr/kerberos/include'])
+            if krb5_h:
+                ssl_incs += krb5_h
 
         if ssl_incs is not None and ssl_libs is not None:
             rtlibs = None