$ wget https://ftp.gnu.org/gnu/texinfo/texinfo-6.7.tar.gz
$ tar xvf texinfo-6.7.tar.gz
$ cd texinfo-6.7/
$ mkdir build
$ cd build
$ ../configure --prefix=/opt/texinfo/6.7
$ make
$ make install

$ export PATH=/opt/texinfo/6.7/bin:${PATH}
$ export LD_LIBRARY_PATH=/opt/texinfo/6.7/lib:${LD_LIBRARY_PATH}