This helped me also.
On cygwin SVN::Core comes in a package called subversion-perl. Handy. Easy.
On solaris it helps to know Alien::SVN is what can provide SVN::Core.
Solaris package for git (for solaris 10 intel/amd) from opensolaris/blastwave doesn't exist! :-o
So even the minimal package management you get with opensolaris pkg-get isn't possible.
Solaris package for git from sunfreeware is available, but for git svn you need to add some things.
I didn't find building Alien::SVN at all straightforward, see here:
Hopefully this can help other hapless solaris users.