Your `mpicc -show` output shows there is no bug in mpicc script. I tried to configure mpiblast with MPICH v3.2 release. I see a slightly different error reported if searching `mpicc -V` in config.log, but the configure is completed without any error. I think the configure just tries to get some compiler information through common options such as `--version`, `-v`, or `-V`. But it does not break the configure if any of those options is unsupported. So you can just ignore this error message. Please let us know if you find other problem break the compiling. Btw, here is the error message on my side. I think we see different errors for `-V` option just because of a different GCC version. gcc version 4.8.5 20150623 (Red Hat 4.8.5-11) (GCC) configure:2855: $? = 0 configure:2862: /home/minsi/git/mpich.git.v3.2/build-gnu-tcp/install/bin/mpicc -V >&5 gcc: error: unrecognized command line option '-V' Min On 4/17/17 4:50 PM, Chandler wrote:

Min Si wrote on 04/15/2017 11:02 AM:

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Can you try `mpicc -show` ?

$ mpicc -show gcc -I/opt/mpich-install/include -L/opt/mpich-install/lib -Wl,-rpath -Wl,/opt/mpich-install/lib -Wl,--enable-new-dtags -lmpi

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Is "mpicc -V" checked by mpiblast configure?

Yes. I attached config.log

On 4/15/17 11:01 AM, Jeff Hammond wrote:

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Try "mpicc -v". I don't remember if GCC version flag is case insensitive.

Yes mpicc -v does work as expected

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