This page was written by Jatin Luthra, a 2016 Google Code-in student, which explains how to install Apertium on FreeBSD
 Install Dependencies
For Standard Apertium Translation
pkg install bash gettext libgcrypt libgpg-error libiconv subversion libxml2 libxslt pcre pcre++ pkgconf autoconf automake libtool flex
If you need vislcg3/cg-proc/cg-comp (Constraint Grammar), you should also do:
pkg install cmake icu boost-all gperf iperf iperf3 gawk
 Compiling and Installing Apertium
Now you can move on to Minimal_installation_from_SVN.