Make sure you have a ~/.subversion/config.  Simply using it (svn --help) will
cause a default one to be created if you don't already have one.

Make the following changes to ~/.subversion/config:

Set:
enable-auto-props = yes

Append/edit auto-props section (if you already use the auto-props for FreeBSD src the entry for Makefile is already done):

[auto-props]
bsd.*.mk     = svn:eol-style=native; svn:keywords=FreeBSD=%H; svn:mime-type=text/plain
distinfo*    = svn:eol-style=native; fbsd:nokeywords=yes; svn:mime-type=text/plain
extrapatch-* = svn:eol-style=native; fbsd:nokeywords=yes; svn:mime-type=text/plain
extra-patch-*= svn:eol-style=native; fbsd:nokeywords=yes; svn:mime-type=text/plain
patch-*      = svn:eol-style=native; fbsd:nokeywords=yes; svn:mime-type=text/plain
pkg-*        = svn:eol-style=native; fbsd:nokeywords=yes; svn:mime-type=text/plain
Makefile*    = svn:eol-style=native; svn:keywords=FreeBSD=%H; svn:mime-type=text/plain

To ignore certain files you can add something like this in the miscellany section:

[miscellany]
global-ignores = *.o *.lo *.la *.al .libs *.so *.so.[0-9]* *.a *.pyc *.pyo
 *.bak *.orig *.rej *~ #*# .#* .*.swp .DS_Store