Bug#904946: gmsh: OpenCASCADE gone

[Joost van Zwieten]

Hi Kurt, Andreas,

I ran into this issue today. When switching from stretch to buster I
noticed that gmsh couldn't read STEP files anymore. The following
error message appears:

    Error   : Gmsh requires OpenCASCADE to import shape

I've fixed the issue by building gmsh with the additional build
dependency libocct-data-exchange-dev. See patch 0001. I've also added
a small autopkgtest (patch 0002) using a STEP file that is part of the
source package.

Best, Joost
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