Checking if your kit is complete...
Looks good
Writing Makefile for Sys::Mmap
cp Mmap.pm blib/lib/Sys/Mmap.pm
/home/cpanrun/ia64/build/5.8.2/bin/perl /home/cpanrun/ia64/build/5.8.2/lib/5.8.2/ExtUtils/xsubpp  -typemap /home/cpanrun/ia64/build/5.8.2/lib/5.8.2/ExtUtils/typemap -typemap typemap  Mmap.xs > Mmap.xsc && mv Mmap.xsc Mmap.c
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 +DSitanium2 +Ofltacc=strict   -DVERSION=\"0.13\" -DXS_VERSION=\"0.13\" +Z "-I/home/cpanrun/ia64/build/5.8.2/lib/5.8.2/IA64.ARCHREV_0-thread-multi/CORE"   Mmap.c
Warning 129: "Mmap.xs", line 14 # Redefinition of macro '_POSIX_C_SOURCE' differs from previous definition at [Unknown position].
    #define _POSIX_C_SOURCE 199309
            ^^^^^^^^^^^^^^^       
Error 172: "Mmap.xs", line 158 # Undeclared variable 'MAP_ANON'.
     if(flags&MAP_ANON) {
              ^^^^^^^^   
Error 168: "Mmap.xs", line 206 # Illegal types associated with operator '-': 'void *' and 'unsigned long'.
     if (munmap(( void * ) ((XPV*) (var)->sv_any)->xpv_pv - ((XPV*) (var)->sv_any)->xpv_len , ((XPV*
                                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^         
make: *** [Mmap.o] Error 2