Attached patch coming from matplotlib corrects the problem
-- 
Fabrice Silva
--- trunk/matplotlib/lib/matplotlib/__init__.py	2007/10/21 16:02:07	3975
+++ trunk/matplotlib/lib/matplotlib/__init__.py	2007/11/02 12:55:51	4094
@@ -234,12 +234,11 @@
 def checkdep_ghostscript():
     try:
         if sys.platform == 'win32':
-            command = 'gswin32c -v'
+            command = 'gswin32c --version'
         else:
-            command = 'gs -v'
+            command = 'gs --version'
         stdin, stdout = os.popen4(command)
-        line = stdout.readlines()[0]
-        v = line.split()[-2]
+        v = stdout.read()[:-1]
         vtest = '.'.join(v.split('.')[:2]) # deal with version numbers like '7.07.1'
         float(vtest)
         return vtest

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