Thread:Project:Support desk/MediaWiki unable to find diff3 and Git during installation

I'm trying to install latest mediawiki (1.23.4) on my Synology NAS (MariaDB 5.5.38-0023; PHP 5.5.13) and MediaWiki is unable to find diff3 and git. I installed ipkg and downloaded diffutils 3.1-1, which contains diff3 and tried installing Git via Package Center and later manually (git 1.8.4.2-1), still nothing.

I found here (bottom, "UNIX utility binaries not found") that I should add :/usr/bin to PHP open_basedir, but ipkg installs everything in /opt/bin, so just in case I added :/usr/bin:/opt/bin there, but still not luck.

ipkg repo: http://ipkg.nslu2-linux.org/feeds/optware/cs08q1armel/cross/stable/

What else could I do ?