Revert the below commit as it didn't work.  The py-qt4 buildlink3.mk may
be included after pyversion.mk, which means the setting has no affect.

---
  Module Name: pkgsrc
  Committed By: sbd
  Date: Tue Aug  7 09:44:03 UTC 2012

  Modified Files:
  pkgsrc/x11/py-qt4: buildlink3.mk

  Log Message:
  Set PYTHON_VERSIONS_INCOMPATIBLE+=25 in the buildlink3.mk so that dependent
  packages won't try to build with python25.

  Fixes Global dependency resolution failure.

  To generate a diff of this commit:
  cvs rdiff -u -r1.3 -r1.4 pkgsrc/x11/py-qt4/buildlink3.mk

(sbd)