git svn cloneが出来ない

環境

$ git svn clone -r HEAD svn+ssh://server/trunk/repo
Initialized empty Git repository in  C:/Users/A/directory/.git/
Can't create session: Unable to connect to a repository at URL 'svn+ssh://server/trunk/repo': Error in child process: exec of 'C:\progra~1\PuTTY\plink.exe -l user -pw password' failed: No such file or directory at C:/Program Files (x86)/Git/mingw32/share/perl5/Git/SVN.pm line 148.

結論から言うとエラーになってる'C:\progra~1\PuTTY\plink.exe -l user -pw password' failed: No such file or directoryはシステム環境変数SVN_SSHを参照していました。 それを削除して再度実行したら成功しました。

$ git svn clone -r HEAD svn+ssh://svn.server/trunk/repo
Initialized empty Git repository in C:/Users/A/directory/.git/
user@svn.server's password:
        A       aaa.txt_
        A       bbb.txt
...
Checking svn:mergeinfo changes since r49056: 1 sources, 0 changed
r49056 = d113acc1cbf4ac3064622a0d1f2af403b1b7cee5 (refs/remotes/git-svn)
Updating files: 100% (5745/5745), done.
Checked out HEAD:
  svn+ssh://svn.server/trunk/repo r49056