Cop out, and set things to be group-writeable recursively. The various
xxxMODE flags don't cut it. Also set the umask to 2 before doing the
compileall on the destination system.
diff --git a/Mac/OSX/Dist/build b/Mac/OSX/Dist/build
index 51ea727..b839ab6 100755
--- a/Mac/OSX/Dist/build
+++ b/Mac/OSX/Dist/build
@@ -91,6 +91,10 @@
 make DIRMODE=775 EXEMODE=775 FILEMODE=664 DESTDIR=$INSTALLROOT frameworkinstall
 make DIRMODE=775 EXEMODE=775 FILEMODE=664 DESTDIR=$INSTALLROOT frameworkinstallextras
 
+# Unfortunately all the ...MODE arguments above still don't do the trick.
+# Cop out, and recursively set everything group-writeable.
+chmod -R ug+w $INSTALLROOT
+
 if [ "$builddocs" = "y" -o "$builddocs" = "Y" ]; then
     ./python.exe $PYTHONSRC/Mac/OSX/setupDocs.py build
     echo ""