Checking if your kit is complete...
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Writing Makefile for Linux::Inotify2
cp Inotify2.pm blib/lib/Linux/Inotify2.pm
/home/cpanrun/pa-risc1.1/build/5.6.1/bin/perl -I/home/cpanrun/pa-risc1.1/build/5.6.1/lib/5.6.1/PA-RISC1.1-thread-multi -I/home/cpanrun/pa-risc1.1/build/5.6.1/lib/5.6.1 /home/cpanrun/pa-risc1.1/build/5.6.1/lib/5.6.1/ExtUtils/xsubpp  -typemap /home/cpanrun/pa-risc1.1/build/5.6.1/lib/5.6.1/ExtUtils/typemap Inotify2.xs > Inotify2.xsc && mv Inotify2.xsc Inotify2.c
cc -c  -D_POSIX_C_SOURCE=199506L -D_HPUX_SOURCE +DA1.1 +DS2.0a +z -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -Ae -O +Onolimit   -DVERSION=\"1.1\" -DXS_VERSION=\"1.1\" +z -I/home/cpanrun/pa-risc1.1/build/5.6.1/lib/5.6.1/PA-RISC1.1-thread-multi/CORE  Inotify2.c
cpp: "inotify.h", line 10: error 4036: Can't open include file 'linux/types.h'.
cpp: "inotify-syscalls.h", line 92: error 4062: "Unsupported architecture!"
make: *** [Inotify2.o] Error 1