Checking if your kit is complete...
Looks good
Writing Makefile for OS2::Focus
cp Focus.pm blib/lib/OS2/Focus.pm
AutoSplitting blib/lib/OS2/Focus.pm (blib/lib/auto/OS2/Focus)
/home/cpanrun/ia64-lp64/build/5.8.2/bin/perl /home/cpanrun/ia64-lp64/build/5.8.2/lib/5.8.2/ExtUtils/xsubpp  -typemap /home/cpanrun/ia64-lp64/build/5.8.2/lib/5.8.2/ExtUtils/typemap -typemap typemap  Focus.xs > Focus.xsc && mv Focus.xsc Focus.c
Please specify prototyping behavior for Focus.xs (see perlxs manual)
cc -c   -D_POSIX_C_SOURCE=199506L -D_REENTRANT -Ae -D_HPUX_SOURCE -Wl,+vnocompatwarnings +DD64 -DNO_HASH_SEED -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -fast +DSitanium2 +Ofltacc=strict   -DVERSION=\"0.01\" -DXS_VERSION=\"0.01\" +Z "-I/home/cpanrun/ia64-lp64/build/5.8.2/lib/5.8.2/IA64.ARCHREV_0-thread-multi-LP64/CORE"  -I. -DINCL_BASE -DINCL_PM Focus.c
Error 112: "Focus.xs", line 5 # Include file <os2emx.h> not found.
    #include <os2emx.h>
             ^^^^^^^^^^
Error 20: "Focus.xs", line 7 # ',' expected before 'rc'.
    static HWND rc;
                ^^ 
Error 20: "Focus.xs", line 17 # ';' expected before '_QueryFocus'.
    _QueryFocus()                                                   \
    ^^^^^^^^^^^                                                      
Error 419: "Focus.xs", line 19 # 'HWND' is used as a type, but has not been defined as a type.
      HWND rc = WinQueryFocus(HWND_DESKTOP);
      ^^^^                                  
Error 172: "Focus.xs", line 19 # Undeclared variable 'HWND_DESKTOP'.
      HWND rc = WinQueryFocus(HWND_DESKTOP);
                              ^^^^^^^^^^^^  
Error 419: "Focus.c", line 104 # 'HWND' is used as a type, but has not been defined as a type.
            HWND    hwndDesktop;
            ^^^^                
Error 419: "Focus.c", line 105 # 'HWND' is used as a type, but has not been defined as a type.
            HWND    hwndSetFocus;
            ^^^^                 
Error 419: "Focus.c", line 106 # 'ULONG' is used as a type, but has not been defined as a type.
            ULONG   flFocusChange = (ULONG)SvIV(ST(2));
            ^^^^^                                      
Error 419: "Focus.c", line 107 # 'BOOL' is used as a type, but has not been defined as a type.
            BOOL    RETVAL;
            ^^^^           
Error 283: "Focus.c", line 112 # Illegal operand type in call expression.
                hwndDesktop = INT2PTR(HWND,tmp);
                              ^^^^^^^           
Error 283: "Focus.c", line 119 # Illegal operand type in call expression.
                hwndSetFocus = INT2PTR(HWND,tmp);
                               ^^^^^^^           
Error 419: "Focus.c", line 143 # 'HWND' is used as a type, but has not been defined as a type.
            HWND    hwndDesktop;
            ^^^^                
Error 699: "Focus.c", line 143 # Error limit reached; halting compilation.
            HWND    hwndDesktop;
            ^^^^                
make: *** [Focus.o] Error 2