Checking if your kit is complete...
Looks good
Writing Makefile for Sort::Key
cp lib/Sort/Key/Maker.pm blib/lib/Sort/Key/Maker.pm
cp lib/Sort/Key/Natural.pm blib/lib/Sort/Key/Natural.pm
cp lib/Sort/Key.pm blib/lib/Sort/Key.pm
cp lib/Sort/Key/Multi.pm blib/lib/Sort/Key/Multi.pm
cp lib/Sort/Key/Register.pm blib/lib/Sort/Key/Register.pm
/home/cpanrun/build/5.6.1/bin/perl -I/home/cpanrun/build/5.6.1/lib/5.6.1/i686-linux-thread-multi -I/home/cpanrun/build/5.6.1/lib/5.6.1 /home/cpanrun/build/5.6.1/lib/5.6.1/ExtUtils/xsubpp  -typemap /home/cpanrun/build/5.6.1/lib/5.6.1/ExtUtils/typemap -typemap typemap -typemap typemap Key.xs > Key.xsc && mv Key.xsc Key.c
gcc -c -I. -DUSE_REENTRANT_API -D_GNU_SOURCE -D_REENTRANT -fno-strict-aliasing -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -O2   -DVERSION=\"1.28\" -DXS_VERSION=\"1.28\" -fpic -I/home/cpanrun/build/5.6.1/lib/5.6.1/i686-linux-thread-multi/CORE  Key.c
Key.xs: In function `_keysort':
Key.xs:280: warning: passing arg 1 of `sortsv' from incompatible pointer type
Key.xs:280: warning: passing arg 2 of `sortsv' makes pointer from integer without a cast
Key.xs:280: warning: passing arg 3 of `sortsv' makes integer from pointer without a cast
Key.xs:280: too few arguments to function `sortsv'
Key.xs: In function `_multikeysort':
Key.xs:567: warning: passing arg 1 of `sortsv' from incompatible pointer type
Key.xs:567: warning: passing arg 2 of `sortsv' makes pointer from integer without a cast
Key.xs:567: warning: passing arg 3 of `sortsv' makes integer from pointer without a cast
Key.xs:567: too few arguments to function `sortsv'
make: *** [Key.o] Error 1