Checking if your kit is complete...
Looks good
Note (probably harmless): No library found for -lmhash
Writing Makefile for Mhash
cp Mhash.pm blib/lib/Mhash.pm
AutoSplitting blib/lib/Mhash.pm (blib/lib/auto/Mhash)
/home/cpanrun/pa-risc1.1/build/5.8.2/bin/perl /home/cpanrun/pa-risc1.1/build/5.8.2/lib/5.8.2/ExtUtils/xsubpp  -typemap /home/cpanrun/pa-risc1.1/build/5.8.2/lib/5.8.2/ExtUtils/typemap  Mhash.xs > Mhash.xsc && mv Mhash.xsc Mhash.c
cc -c   -D_POSIX_C_SOURCE=199506L -D_REENTRANT -Ae -D_HPUX_SOURCE -Wl,+vnocompatwarnings -DNO_HASH_SEED -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -fast +Onolimit +Opromote_indirect_calls +DAportable +DS2.0   -DVERSION=\"0.90\" -DXS_VERSION=\"0.90\" +Z "-I/home/cpanrun/pa-risc1.1/build/5.8.2/lib/5.8.2/PA-RISC1.1-thread-multi/CORE"   Mhash.c
cc -c   -D_POSIX_C_SOURCE=199506L -D_REENTRANT -Ae -D_HPUX_SOURCE -Wl,+vnocompatwarnings -DNO_HASH_SEED -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -fast +Onolimit +Opromote_indirect_calls +DAportable +DS2.0   -DVERSION=\"0.90\" -DXS_VERSION=\"0.90\" +Z "-I/home/cpanrun/pa-risc1.1/build/5.8.2/lib/5.8.2/PA-RISC1.1-thread-multi/CORE"   mh-interface.c
cpp: "mh-interface.c", line 15: error 4036: Can't open include file 'mhash.h'.
make: *** [mh-interface.o] Error 1