svn merge fails in 0.15

I haven't been able to get "svn merge" to work, neither in 0.14.3 nor
in 0.15:

sams[44] /afs/informatik.uni-tuebingen.de/i386_fbsd46/subversion-0.14.3/bin/svn merge -r 86:87 http://sperber@subversion.informatik.uni-tuebingen.de/svn/repos/s48/s48/rk s48-tuebingen
svn: Invalid argument
svn: Non-ascii character (code 252) detected, and unable to convert to UTF-8.

sams[45] /afs/informatik.uni-tuebingen.de/i386_fbsd46/subversion-0.15/bin/svn merge -r 86:87 http://sperber@subversion.informatik.uni-tuebingen.de/svn/repos/s48/s48/rk s48-tuebingen
svn: Invalid argument
svn: Non-ascii character (code 131) detected, and unable to convert to UTF-8.

A truss shows the place where it happens, in case it's any help.

stat("/afs/informatik.uni-tuebingen.de/home/sperber/.subversion/config",0xbfbfe570) ERR#2 'No such file or directory'
open("/afs/informatik.uni-tuebingen.de/home/sperber/.subversion/config",0xa01,0666) = 3 (0x3)
write(3,0x281e5ae0,1800) = 1800 (0x708)
close(3) = 0 (0x0)
svn: Invalid argument
write(2,0xbfbfd638,22) = 22 (0x16)
svn: Non-ascii character (code 131) detected, and unable to convert to UTF-8.

write(2,0xbfbfd628,79) = 79 (0x4f)
sigprocmask(0x1,0x280deaa0,0xbfbfe83c) = 0 (0x0)
sigprocmask(0x3,0x280deab0,0x0) = 0 (0x0)

This is on FreeBSD 4.6.2 with BDB 4.0.14.

Any ideas?

-- 
Cheers =8-} Mike
Friede, Völkerverständigung und überhaupt blabla
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