Checking if your kit is complete...
Looks good
Writing Makefile for IO::Epoll
cp lib/IO/Epoll.pm blib/lib/IO/Epoll.pm
AutoSplitting blib/lib/IO/Epoll.pm (blib/lib/auto/IO/Epoll)
/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  Epoll.xs > Epoll.xsc && mv Epoll.xsc Epoll.c
Please specify prototyping behavior for Epoll.xs (see perlxs manual)
cc -c  -I. -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=\"0.01\" -DXS_VERSION=\"0.01\" +Z "-I/home/cpanrun/pa-risc1.1/build/5.8.2/lib/5.8.2/PA-RISC1.1-thread-multi/CORE"   Epoll.c
cpp: "Epoll.xs", line 7: error 4036: Can't open include file 'sys/epoll.h'.
make: *** [Epoll.o] Error 1