A. The problem with the undefined symbol. I did have g77 installed, but removing it did not solve the problem. I tried installing a different version of Atlas - following the note on matrix arithmetic - but that just produced the same error referring to a different library. In the end, I had to remove Atlas altogether - together with other libraries that depend upon it. Now, the NIST test script runs properly. I may trying adding Atlas back - cautiously - but the extra speed isn't that important for me. So - beware Atlas under Ubuntu. B. Files in the wrong place My path - on both Ubuntu & OpenSUSE - does include /usr/local/bin. I don't know about ldconfig, but you are correct in identifying the file ~/.gretl2rc as the source of the problem, though because it is being wrongly created rather than because it is a stale version. As a test I cleaned every vestige of gretl off my OpenSUSE system and emptied the trash. Then I recompiled gretl from scratch with the default options. Finally, I ran gretl - exactly the same problem as before : the program looks for files in /usr/share/gretl/ rather than /usr/local/share/gretl/. I checked the contents of .gret2rc and this contains the following lines at the top # gretl config file # Main gretl directory gretldir = /usr/share/gretl/ I assume that gretldir should be /usr/local/share/gretl/. If I delete just .gretl2rc and try again, the re-created version is identical. At this point I am stuck, though it is no inconvenience to compile gretl with the prefix option to force everything to go in the same place. Gordon OK, we'd be interested to hear what you find. Delete (or edit) ~/.gretl2rc and try again. I strongly suspect you have a stale personal gretl config file in place that is pointing to the wrong location for gretl's shared files.