[Gmsh] Compile Gmsh with OpenCascade support

[Martin Vymazal]

Hello Gmsh users and developers,

  I compiled OpenCascade 6.3.0 and I can also compile gmsh from source  
(I just updated from svn repository), but I didn't find information  
how to link OpenCascade libraries to gmsh. When I launch ccmake from  
my build directory, I set the option ENABLE_OCC to 'ON', but the  
resulting gmsh build doesn't have support for OpenCascade. The same  
happens with 'cd build; cmake -DENABLE_OCC=1"

It's a bit strange that I don't have any option to set the path to the  
opencascade include files and to the actual opencascade library.  
Exporting the variable CASROOT which contains the path to 'ros'  
directory inside the OpenCascade source tree doesn't help either. Can  
you point me to some howto?

Thank you,

    Martin Vymazal

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