I got the following error related to Encode.pm when I build my Ikiwiki instance

$ ikiwiki --setup mysite.setup
'git pull --prune origin' failed:  at /usr/pkg/lib/perl5/vendor_perl/5.20.0/IkiWiki/Plugin/git.pm line 220.
Cannot decode string with wide characters at /usr/pkg/lib/perl5/5.20.0/darwin-thread-multi-2level/Encode.pm line 175.

Any idea how to fix it?

I installed ikiwiki via pkgsrc on OS X 10.10.2:

 $ ikiwiki --version
 ikiwiki version 3.20141016
 $ uname -a
 Darwin qazwsx.local 14.1.0 Darwin Kernel Version 14.1.0: Mon Dec 22 23:10:38 PST 2014; root:xnu-2782.10.72~2/RELEASE_X86_64 x86_64
 $ which perl
 $ perl --version

 This is perl 5, version 18, subversion 2 (v5.18.2) built for darwin-thread-multi-2level
 (with 2 registered patches, see perl -V for more detail)