Hi, I am trying to port my recently developed CFD code to a IBM machine running AIX but I am having some trouble building petsc-dev although I was able to build regular petsc on the same system. I guess it has to do with C++ and SIEVE. The error message I got was: ================================================================================= Configuring PETSc to compile on your system ================================================================================= TESTING: alternateConfigureLibrary from PETSc.packages.blopex (config/PETSc/package********************************************************************************* UNABLE to CONFIGURE with GIVEN OPTIONS (see configure.log for details): --------------------------------------------------------------------------------------- Sieve requires boost, and configure could not locate it. Suggest using --download-boost=1 ********************************************************************************* The way I used to configure is: PETSC_DIR=`pwd` config/configure.py --with-fortran=0 --with-clanguage=C++ --with-sieve=1 --download-boost=1 I have attached the configure.log file for your review. I noticed it says something about empty header file docsonly/include/petscfix.h, which I do find to be empty even on my Linux clusters. But the Linux systems have a different non-empty copy at linux-gnu-cxx-opt/include after the successful build. Please help. Thank you very much. Shi -- Sincerely, Shi Jin, Ph.D. http://www.ualberta.ca/~sjin1/