- from Debian changelog:

  * Internally set CASROOT within source code, so users don't need to
    define it (Thanks: Denis Barbier).
http://git.debian.org/?p=debian-science/packages/opencascade.git;a=blob;f=debian/patches/casroot.patch
  with 2 issues:
- doesn't contain:
  * Let debian/patches/casroot.patch also patch Resource_Manager.cxx,
    this class is used to load various default values.
- how about hardcoded /usr/lib/libTKOpenGl.so?

Changed files:
    OpenCASCADE6.3.0-casroot.patch -> 1.3