Replace outdated link to Apache Serf in INSTALL.
* INSTALL: The link is outdated. Update
it to
@@ -288,7 +288,7 @@ I. INTRODUCTION
instead.
Apache Serf can be obtained via your system's package distribution
- system or directly from http://code.google.com/p/serf/.
+ system or directly from https://serf.apache.org/.
For more information on Apache Serf and Subversion's ra_serf, see the
file subversion/libsvn_ra_serf/README.
