Do convert_path() on script paths (now PyXML builds out of the box
under MacOS.)
diff --git a/Lib/distutils/command/build_scripts.py b/Lib/distutils/command/build_scripts.py
index 653b8d8..611767e 100644
--- a/Lib/distutils/command/build_scripts.py
+++ b/Lib/distutils/command/build_scripts.py
@@ -9,6 +9,7 @@
 import sys, os, re
 from distutils.core import Command
 from distutils.dep_util import newer
+from distutils.util import convert_path
 
 # check if Python is called on the first line with this expression
 first_line_re = re.compile(r'^#!.*python(\s+.*)?')
@@ -54,6 +55,7 @@
         self.mkpath(self.build_dir)
         for script in self.scripts:
             adjust = 0
+            script = convert_path(script)
             outfile = os.path.join(self.build_dir, os.path.basename(script))
 
             if not self.force and not newer(script, outfile):