configuring 3rd party clang and mpfr
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When using third-party compilers, it is currently possible to build gcc with a system or third-party installation of gmp/mpfr. The clang installation does not normally need these. However CGAL does normally build using gmp/mpfr. If these are not available on the system, it is also possible to compile without. Eg,
./makeCGAL gmp-none mpfr-none
This mostly solves the problem, but only until the final link stage. The wmake rules for CGAL include -lmpfr
explicitly. As a workaround, this can be removed, but a better solution may be to check the contents of the CGAL/compiler_config.h for this type of content:
#define CGAL_USE_GMP 1
#define CGAL_USE_MPFR 1
//#define CGAL_USE_GMPXX 1