CGAL users discussion list

[Fernando Cacciola <>]

Hi Sylvain,

> Fernando Cacciola wrote:
> > Hi Tom Dreyfus,
> >
> > > Installation Manual, chapter 2.4 Exact Arithmetic:
> > > "Having GMP version 4.1.4 or higher and MPFR version 2.2.1 or higher 
> > > installed is *highly recommended*."
> > >
> > > But I cannot install CGAL 3.4 without MPFR.
> > Indeed.
> >
> > That is a documentation bug since GMP and MPFR are requirements.
> > You need to installed them both.
>
> I thought MPFR was only needed when support for GMP was activated.

You are right, and I see that what I write is not the same... so let me try 
again:

It is ether GMP+MPFR or none of them, which the documentation doesn't state.


If CMake detects GMP it will *require* MPFR, otherwise insallation will continue 
without GMP+MPFR support.

If you wish to bypass detection of GMP so that lacking MPFR doesn't prevent 
installation you should use:  WITH_GMP=FALSE

Best

Fernando Cacciola
www.geometryfactory.com