SVN Merging For Version 1.4-

Merging for svn 1.4- is a bit different than for newer versions.  
This is what I have found that works for merging a trunk to a branch:
svn merge \
  svn+ssh://svn.example.com/repo/myproject/branches/newbranch@HEAD \
  svn+ssh://svn.example.com/repo/myproject/trunk@HEAD \
  /sites/myproject/src/myproject-workingcopy


*NOTE: seems weird that the trunk is the argument after the branch, but my trunk changes weren't being merged in when I did it the other way.

It seems that with svn version pre 1.4, you must specify the version where your branch was last copied or merged from.  If your branch was created at version 234, then the following command would merge it. 
svn merge --dry-run \
  svn+ssh://svn.example.com/export/myproject/branches/newbranchh@234 \
  svn+ssh://svn.example.com/export/myproject/trunk/@HEAD .


http://www.svnforum.org/threads/38394-1.4-merge