Hi all, I installed the Petsc 3.1 recently and when I tried to make my program using Petsc 3.1 it said: In file included from /home/rlchen/soft/petsc-3.1-p4/include/petscsys.h:1467, from /home/rlchen/soft/petsc-3.1-p4/include/petscis.h:7, from /home/rlchen/soft/petsc-3.1-p4/include/petscao.h:8, from joab.h:87, from joab.c:54: /home/rlchen/soft/petsc-3.1-p4/include/petscerror.h:81:1: warning: "__SDIR__" redefined <command line>:1:1: warning: this is the location of the previous definition . . . . I never defined the "__SDIR__" and I do not know why it said I redefined "__SDIR__". But I can run my program on Petsc 3.0. Can anyone tell me how to fix this problem? Thank you! Best, Rongliang