Some days ago I tried installing svk on MacOSX using fink.
Everything worked fine except when I finally tried to use it:

aljoscha% svk
Can't locate Class/Autouse.pm in @INC 
(@INC contains: /System/Library/Perl/5... [snip] ...5.8.1 .) at /Library/Perl/5.8.6/SVK.pm line 6.
BEGIN failed--compilation aborted at /Library/Perl/5.8.6/SVK.pm line 6.
Compilation failed in require at /usr/bin/svk line 6.
BEGIN failed--compilation aborted at /usr/bin/svk line 6.

The solution was not so obvious to me: Fink sets its paths in
/sw/bin/init.sh (/sw/bin/init.csh for csh users respectively)

Putting a

source /sw/bin/init.sh

into your ~/.zshrc makes svk happy.