To install the script and man pages in the standard areas,
give the sequence of commands

 perl Makefile.PL
 make
 make install

If you want to install the script in your own private space, use

 perl Makefile.PL PREFIX=/my/private/perllib \
      INSTALLMAN1DIR=/my/private/perllib/man/man1 \
      INSTALLMAN3DIR=/my/private/perllib/man/man3
 make
 make install

Or, just do

 cp -p texref /usr/local/bin
 cp -p texref /usr/local/man/man1