Those using git may have noticed that I recently added a configure option for the gretl build, --disable-gmp. Here are a few words of caution and explanation. First, using the new option is not generally recommended. Besides supporting the "mpols" command we also make use of the GMP library in various contexts where we reach the edge of numerical precision using standard 8-byte "doubles". And disabling GMP also disables the --progressive option to the "loop" command. I introduced the option to ease building of gretl on high performance clusters. I find that GMP is not usually installed by default so you have to compile the library yourself, and that can be tricky if the head nodes (where you log in and build stuff) differ in architecture from the compute nodes. So, best to think of this as a "cluster only" option, which may make life easier if you're pretty sure the jobs you want to run won't require GMP. Allin