CGAL wmake sets incorrect paths to MPFR and GMP

When compiling OpenFOAM v1606, the ./makeGcc script gets the MPFR and GMP libraries placed in the lib64/ sub-directory, while $WM_PROJECT_DIR/wmake/rules/General/CGAL sets paths explicitly to /lib.

$ ls -al $WM_THIRD_PARTY_DIR/platforms/linux64/gmp-5.1.2 include lib64 share

$ ls -al $WM_THIRD_PARTY_DIR/platforms/linux64/mpfr-3.1.2 include lib64 share

$ cat $WM_PROJECT_DIR/wmake/rules/General/CGAL CGAL_INC = \ -I$(CGAL_ARCH_PATH)/include \ -I$(MPFR_ARCH_PATH)/include \ -I$(GMP_ARCH_PATH)/include \ -I$(BOOST_ARCH_PATH)/include

CGAL_LIBS = \ -L$(MPFR_ARCH_PATH)/lib \ -L$(GMP_ARCH_PATH)/lib \ -L$(BOOST_ARCH_PATH)/lib \ -L$(CGAL_ARCH_PATH)/lib \ -lCGAL \ -lmpfr

The simple fix is to create symlinks like so:

$ cd $WM_THIRD_PARTY_DIR $ (cd platforms/linux64/gmp-5.1.2; ln -s lib64 lib) $ (cd platforms/linux64/mpfr-3.1.2; ln -s lib64 lib)