diff -ruN nmap-5.50.orig/zenmap/zenmapCore/Paths.py nmap-5.50/zenmap/zenmapCore/Paths.py
--- nmap-5.50.orig/zenmap/zenmapCore/Paths.py	2013-06-06 05:52:10.723087428 +0000
+++ nmap-5.50/zenmap/zenmapCore/Paths.py	2013-06-06 07:07:25.481261761 +0000
@@ -115,7 +115,10 @@
     else:
         # Normal script execution. Look in the current directory to allow
         # running from the distribution.
-        return os.path.abspath(os.path.dirname(fs_dec(sys.argv[0])))
+        #
+        # Grrwlf: No,no,dear. That's not a script, thats Nixos wrapper. Go add
+        # those '..' to substract /bin part.
+        return os.path.abspath(os.path.join(os.path.dirname(fs_dec(sys.argv[0])), ".."))

 prefix = get_prefix()