Ahhh solaris 9 huh - Yeah I have had problems installing modules on Solaris before - I have had a lot more luck with Solaris 10 since it is more "linuxy" I don't have the version module installed. Have you tried to install using the -force option? That has worked for me in the past even though the test threw some failures out. Especially on Solaris platform.
Okay updated ..I just tried to install on Solaris 8 and didn't even get as far as you did = (
I am still trying to figure this out....
# uname -a
sunOS jabberwocky 5.8 Generic_108528-22 sun4u sparc SUNW,UltraAX-i2
# perl Makefile.PL
Can't locate object method "splitpath" via package "File::Spec" at inc
+/Module/Install/PERSONAL/only.pm - /Users/ingy/lib/Module/Install/PER
+SONAL/only.pm line 58.