Checking if your kit is complete...
Looks good
Writing Makefile for Linux::NBD
cp lib/Linux/NBD/Server.pm blib/lib/Linux/NBD/Server.pm
cp lib/Linux/NBD/Client.pm blib/lib/Linux/NBD/Client.pm
cp lib/Linux/NBD.pm blib/lib/Linux/NBD.pm
/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  NBD.xs > NBD.xsc && mv NBD.xsc NBD.c
Please specify prototyping behavior for NBD.xs (see perlxs manual)
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=\"0.9\" -DXS_VERSION=\"0.9\" +Z "-I/home/cpanrun/pa-risc1.1/build/5.8.2/lib/5.8.2/PA-RISC1.1-thread-multi/CORE"   NBD.c
cpp: "NBD.xs", line 7: error 4036: Can't open include file 'endian.h'.
cpp: "NBD.xs", line 11: error 4036: Can't open include file 'byteswap.h'.
cpp: "NBD.xs", line 15: error 4036: Can't open include file 'linux/nbd.h'.
make: *** [NBD.o] Error 1