Checking if your kit is complete...
Looks good
Note (probably harmless): No library found for -lplot
Writing Makefile for Graphics::Libplot
cp Libplot.pm blib/lib/Graphics/Libplot.pm
AutoSplitting blib/lib/Graphics/Libplot.pm (blib/lib/auto/Graphics/Libplot)
/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  Libplot.xs > Libplot.xsc && mv Libplot.xsc Libplot.c
Please specify prototyping behavior for Libplot.xs (see perlxs manual)
gcc -c   -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=\"2.2.2\" -DXS_VERSION=\"2.2.2\"  "-I/Users/cpanrun/pristine/5.8.7/lib/5.8.7/darwin-thread-multi-2level/CORE"   Libplot.c
Libplot.xs:11:18: error: plot.h: No such file or directory
Libplot.xs:11:18: error: plot.h: No such file or directory
Libplot.c: In function 'XS_Graphics__Libplot_pl_outfile':
Libplot.c:427: warning: assignment makes pointer from integer without a cast
Libplot.c: In function 'XS_Graphics__Libplot_pl_outfile':
Libplot.c:427: warning: assignment makes pointer from integer without a cast
lipo: can't open input file: /var/tmp//cc2DLnDv.out (No such file or directory)
make: *** [Libplot.o] Error 1