Checking if your kit is complete...
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Writing Makefile for Sort::Key::Top
cp lib/Sort/Key/Top.pm blib/lib/Sort/Key/Top.pm
/home/cpanrun/ia64-lp64/build/5.6.1/bin/perl -I/home/cpanrun/ia64-lp64/build/5.6.1/lib/5.6.1/IA64.ARCHREV_0-thread-multi-64all -I/home/cpanrun/ia64-lp64/build/5.6.1/lib/5.6.1 /home/cpanrun/ia64-lp64/build/5.6.1/lib/5.6.1/ExtUtils/xsubpp  -typemap /home/cpanrun/ia64-lp64/build/5.6.1/lib/5.6.1/ExtUtils/typemap Top.xs > Top.xsc && mv Top.xsc Top.c
gcc -c -I. -DUSE_REENTRANT_API -D_POSIX_C_SOURCE=199506L -D_HPUX_SOURCE -mlp64 -L/lib/hpux64 -DUINT32_MAX_BROKEN -fPIC -fno-strict-aliasing -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -O   -DVERSION=\"0.03\" -DXS_VERSION=\"0.03\" -fPIC -I/home/cpanrun/ia64-lp64/build/5.6.1/lib/5.6.1/IA64.ARCHREV_0-thread-multi-64all/CORE  Top.c
Top.xs: In function `_keytop':
Top.xs:422: warning: passing arg 1 of `sortsv' from incompatible pointer type
Top.xs:422: warning: passing arg 2 of `sortsv' makes pointer from integer without a cast
Top.xs:422: warning: passing arg 3 of `sortsv' makes integer from pointer without a cast
Top.xs:422: error: too few arguments to function `sortsv'
make: *** [Top.o] Error 1