Checking if your kit is complete...
Looks good
Writing Makefile for Parallel::MPI
cp MPI.pm blib/lib/Parallel/MPI.pm
AutoSplitting blib/lib/Parallel/MPI.pm (blib/lib/auto/Parallel/MPI)
/Users/cpanrun/pristine/5.8.7/bin/perl /Users/cpanrun/pristine/5.8.7/lib/5.8.7/ExtUtils/xsubpp  -typemap /Users/cpanrun/pristine/5.8.7/lib/5.8.7/ExtUtils/typemap -typemap typemap  MPI.xs > MPI.xsc && mv MPI.xsc MPI.c
mpicc -c  -I/usr/local/mpich/include -fno-common -DPERL_DARWIN -no-cpp-precomp -arch ppc -arch i386 -nostdinc -B/Developer/SDKs/MacOSX10.4u.sdk/usr/include/gcc -B/Developer/SDKs/MacOSX10.4u.sdk/usr/lib/gcc -isystem/Developer/SDKs/MacOSX10.4u.sdk/usr/include -F/Developer/SDKs/MacOSX10.4u.sdk/System/Library/Frameworks -mmacosx-version-min=10.3 -DUSE_SITECUSTOMIZE -DNO_HASH_SEED -fno-strict-aliasing -pipe -O3   -DVERSION=\"0.03\" -DXS_VERSION=\"0.03\"  "-I/Users/cpanrun/pristine/5.8.7/lib/5.8.7/darwin-thread-multi-2level/CORE"  -DFLOAT_HACK MPI.c
/bin/sh: line 1: mpicc: command not found
make: *** [MPI.o] Error 127