Bug#738540: libmgl-dev: clang cannot be used to compile an application using mathgl

[Sylvain Joubert]

I've found an alternative in Debian which will avoid rebuilding mathgl: 
I have updated my compiler to clang-3.4 (I previously used clang-3.3).
clang-3.4 is able to find <omp.h> so I can compile my application with 
this version of the compiler.

I still think the <omp.h> include is an upstream bug that should be 
reported/fixed.