Checking if your kit is complete...
Looks good
Writing Makefile for Device::ParallelPort::drv::linux
cp linux.pm blib/lib/Device/ParallelPort/drv/linux.pm
/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 linux.xs > linux.xsc && mv linux.xsc linux.c
Please specify prototyping behavior for linux.xs (see perlxs manual)
gcc -c  -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=\"1.00\" -DXS_VERSION=\"1.00\" -fPIC -I/home/cpanrun/ia64/build/5.6.1/lib/5.6.1/IA64.ARCHREV_0-thread-multi/CORE  linux.c
linux.xs:11:20: asm/io.h: No such file or directory
make: *** [linux.o] Error 1