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/ia64/build/5.6.1/bin/perl -I/home/cpanrun/ia64/build/5.6.1/lib/5.6.1/IA64.ARCHREV_0-thread-multi -I/home/cpanrun/ia64/build/5.6.1/lib/5.6.1 /home/cpanrun/ia64/build/5.6.1/lib/5.6.1/ExtUtils/xsubpp  -typemap /home/cpanrun/ia64/build/5.6.1/lib/5.6.1/ExtUtils/typemap Epoll.xs > Epoll.xsc && mv Epoll.xsc Epoll.c
Please specify prototyping behavior for Epoll.xs (see perlxs manual)
gcc -c -I. -DUSE_REENTRANT_API -D_POSIX_C_SOURCE=199506L -D_HPUX_SOURCE -L/lib/hpux32 -DUINT32_MAX_BROKEN -fPIC -fno-strict-aliasing -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -O   -DVERSION=\"0.01\" -DXS_VERSION=\"0.01\" -fPIC -I/home/cpanrun/ia64/build/5.6.1/lib/5.6.1/IA64.ARCHREV_0-thread-multi/CORE  Epoll.c
Epoll.xs:7:23: sys/epoll.h: No such file or directory
Epoll.xs: In function `XS_IO__Epoll_epoll_ctl':
Epoll.xs:26: error: storage size of 'event' isn't known
Epoll.xs: In function `XS_IO__Epoll_epoll_wait':
Epoll.xs:44: error: invalid application of `sizeof' to incomplete type `epoll_event' 
Epoll.xs:57: error: invalid use of undefined type `struct epoll_event'
Epoll.xs:57: error: dereferencing pointer to incomplete type
Epoll.xs:58: error: invalid use of undefined type `struct epoll_event'
Epoll.xs:58: error: dereferencing pointer to incomplete type
make: *** [Epoll.o] Error 1