Checking if your kit is complete...
Looks good
Note (probably harmless): No library found for -lplplotd
Writing Makefile for Graphics::PLPLOT
cp PLPLOT.pm blib/lib/Graphics/PLPLOT.pm
/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  PLPLOT.xs > PLPLOT.xsc && mv PLPLOT.xsc PLPLOT.c
Please specify prototyping behavior for PLPLOT.xs (see perlxs manual)
cc -c  -I/usr/local/include -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=\"0.01\" -DXS_VERSION=\"0.01\" +Z "-I/home/cpanrun/parisc2.0-lp64/build/5.8.2/lib/5.8.2/PA-RISC2.0-thread-multi-LP64/CORE"   PLPLOT.c
cpp: "PLPLOT.xs", line 33: error 4036: Can't open include file 'plplot/plplot.h'.
make: *** [PLPLOT.o] Error 1