Do an actual test for xcodebuild, in stead of relying on the user to
uncomment the relevant section.
diff --git a/Mac/OSX/Makefile b/Mac/OSX/Makefile
index 3c82a24..e8d1529 100644
--- a/Mac/OSX/Makefile
+++ b/Mac/OSX/Makefile
@@ -9,10 +9,12 @@
LIBDEST=$(prefix)/lib/python$(VERSION)
BUILDPYTHON=$(builddir)/python.exe
DESTDIR=
-# For 10.2:
-#PBXBUILD=pbxbuild
-# For 10.3:
+# Test whether to use xcodebuild (preferred) or pbxbuild:
+ifeq ($(shell ls /usr/bin/xcodebuild),/usr/bin/xcodebuild)
PBXBUILD=xcodebuild
+else
+PBXBUILD=pbxbuild
+endif
# These are normally glimpsed from the previous set
bindir=/usr/local/bin