With Subversion r265695 (Git commit
22e052725189a472e4e86ebb6595278a49f4bcdd)
"Update GCC to autoconf 2.69, automake 1.15.1 (PR bootstrap/82856)" we're back
to normal; per Automake 1.15.1 'configure.ac' still "[...] perl 5.6 or better
is required [...]".
PR bootstrap/82856
gcc/
* doc/install.texi (Perl): Back to requiring "Perl version 5.6.1 (or
later)".
systems' @command{tar} programs will also work, only try GNU
@command{tar} if you have problems.
-@item Perl version between 5.6.1 and 5.6.24
+@item Perl version 5.6.1 (or later)
Necessary when targeting Darwin, building @samp{libstdc++},
and not using @option{--disable-symvers}.