Path oddity in PNetCDF build/configure

[Carl Ponder]

When I build PNetCDF with MPICC=mpicc and mpicc on my$PATH, I see this 
during the configure phase:

    ENV PATH=${PATH}:/usr/local/bin
    ENV MPICC mpicc
    ...
    checking for sed handling option -i ... /usr/bin/sed -i''
    *checking mpicc under yes... no*
    configure: error:
    -----------------------------------------------------------------------
          Specified MPI C compiler "mpicc" cannot be found under yes
          PnetCDF requires a working MPI C compiler. Please specify the
    location
          of an MPI C compiler, either in the MPICC environment variable
          (not CC variable) or through --with-mpi configure flag. Abort.
    -----------------------------------------------------------------------

I can work around it by making the path absolute

    ENV MPICC /usr/local/bin/mpicc
    ...
    checking for sed handling option -i ... /usr/bin/sed -i''
    *checking whether /usr/local/bin/mpicc exists and is executable... yes*

But, based on the first message, I'm thinking there's an incorrect 
path-search during the configure phase.
This is with PNetCDF 1.12.2.
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