Everything is ok after installing the texlive-fonts-extra package. @Clive - I think that a video tutorial could be a great help for average users (like me). Thank you all for your help. "Speaking as somebody who pissed off the entire list last year with my running commentary on a whole litany of -gretl- installation issues via Linux, try this and see if it works, assuming a clean install from scratch: sudo apt-get install texlive-latex-extra texlive-fonts-recommended texlive-fonts-extra sudo rm -rf gretl-git git clone git://git.code.sf.net/p/gretl/git gretl-git cd gretl-git sudo apt-get build-dep gretl ./configure --prefix=/usr/local --enable-quiet-build --enable-openmp --enable-build-doc --disable-json make -j3 make pdfdocs cli/gretlcli -v sudo make install sudo /sbin/ldconfig gretl &"