Index: buildlibxml.py
===================================================================
--- buildlibxml.py	(revision 60367)
+++ buildlibxml.py	(working copy)
@@ -165,17 +165,17 @@
     prefix = os.path.join(os.path.abspath(build_dir), 'libxml2')
     safe_mkdir(prefix)
 
-    call_setup = {}
+    call_setup = {'env':os.environ.copy()}
     env_setup = None
     if sys.platform in ('darwin',):
         # We compile Universal if we are on a machine > 10.3
         major_version = int(os.uname()[2].split('.')[0])
         if major_version > 7:
-            call_setup['env'] = {
+            call_setup['env'].update({
                 'CFLAGS' : "-arch ppc -arch i386 -isysroot /Developer/SDKs/MacOSX10.4u.sdk -O2",
                 'LDFLAGS' : "-arch ppc -arch i386 -isysroot /Developer/SDKs/MacOSX10.4u.sdk",
                 'MACOSX_DEPLOYMENT_TARGET' : "10.3"
-                }
+                })
 
         # We may loose the link to iconv, so make sure it's there
         static_binaries.append('-liconv')