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)
/home/cpanrun/parisc2.0-lp64/build/5.8.2/bin/perl /home/cpanrun/parisc2.0-lp64/build/5.8.2/lib/5.8.2/ExtUtils/xsubpp  -typemap /home/cpanrun/parisc2.0-lp64/build/5.8.2/lib/5.8.2/ExtUtils/typemap -typemap typemap  Libplot.xs > Libplot.xsc && mv Libplot.xsc Libplot.c
Please specify prototyping behavior for Libplot.xs (see perlxs manual)
cc -c   -D_POSIX_C_SOURCE=199506L -D_REENTRANT -Ae -D_HPUX_SOURCE -Wl,+vnocompatwarnings +DD64 -DNO_HASH_SEED -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -fast +Onolimit +Opromote_indirect_calls   -DVERSION=\"2.2.2\" -DXS_VERSION=\"2.2.2\" +Z "-I/home/cpanrun/parisc2.0-lp64/build/5.8.2/lib/5.8.2/PA-RISC2.0-thread-multi-LP64/CORE"   Libplot.c
cpp: "Libplot.xs", line 11: error 4036: Can't open include file 'plot.h'.
make: *** [Libplot.o] Error 1