[PPL-devel] configure problem when gmpxx is not installed in standard location

Hi,

I found that PPL stops in configure when using --with-libgmpxx-prefix as it does not use the -I path to gmpxx and the gmpxx.h is not found. I managed to get around by setting the appropriate -I path in CXXFLAGS, and then configure stops again because it does not find the gmpxx lib, so I fixed temporarily this with setting LDFLAGS with the right -L path. I think that there is a missing bit in the configury files. This is with pre24 and also in the last pre32.

Sebastian