Hi All, Using: Python 2.5.2, f2py ver 2_4422, gfortran --version GNU Fortran (GCC) 4.2.3 (Ubuntu 4.2.3-2ubuntu7) on kubuntu 8.04 (Hardy) up-to-date on a Thinkpad T60. After building and using an f2py-generated lib for a while with this command: f2py --opt="-O3" -c -m fd_rrt1d --fcompiler=gnu95 \ --link-lapack_opt *.f I had to regenerate it after some code changes (just commenting out some debugging info). Altho the shared lib gets built correctly, when the calling python is run, I now get this: ./1d.py Traceback (most recent call last): File "./1d.py", line 27, in <module> from fd_rrt1d import * ImportError: /home/hjm/shaka/1D-Mangalam-py/fd_rrt1d.so: undefined symbol: zgemm_ sure enough, nm reports it as undefined: nm fd_rrt1d.so |tail 000065b0 t string_from_pyobj U strlen@@GLIBC_2.0 U strncpy@@GLIBC_2.0 0001df40 b u.1294 00013bee T umatrix1d_dms0_ 000128c3 T umatrix1d_dms1_ 00015458 T umatrix1d_ms0_ U zgemm_ U zgemv_ U zgesv_ but why the recent change? Google and the numpy list seem not to have heard about this one.. -- Harry Mangalam - Research Computing, NACS, E2148, Engineering Gateway, UC Irvine 92697 949 824-0084(o), 949 285-4487(c) -- ..Kick at the darkness til it bleeds daylight. (Lovers in a Dangerous Time) - Bruce Cockburn