Checking if your kit is complete...
Looks good
Writing Makefile for Ctype
cp Ctype.pm blib/lib/Ctype.pm
AutoSplitting blib/lib/Ctype.pm (blib/lib/auto/Ctype)
/export/home/cpanrun/build/5.6.1/bin/perl -I/export/home/cpanrun/build/5.6.1/lib/5.6.1/sun4-solaris-thread-multi -I/export/home/cpanrun/build/5.6.1/lib/5.6.1 /export/home/cpanrun/build/5.6.1/lib/5.6.1/ExtUtils/xsubpp  -typemap /export/home/cpanrun/build/5.6.1/lib/5.6.1/ExtUtils/typemap Ctype.xs > Ctype.xsc && mv Ctype.xsc Ctype.c
gcc -c  -DUSE_REENTRANT_API -D_POSIX_PTHREAD_SEMANTICS -D_REENTRANT -fno-strict-aliasing -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -O   -DVERSION=\"0.02\" -DXS_VERSION=\"0.02\" -fPIC -I/export/home/cpanrun/build/5.6.1/lib/5.6.1/sun4-solaris-thread-multi/CORE  Ctype.c
Ctype.xs:4: Config.h: No such file or directory
make: *** [Ctype.o] Error 1