It is alway good to find a bug :) At line 16919 of the configure script we have: elif test $GPMAJOR -eq 4 && test $GPMINOR -ge 2 ; then It should be: elif test $GPMAJOR -eq 4 && test $GPMINOR -ge 4 ; then ---- This was allowing to build gretl GUI with: [jboss@candy-house gretl]$ gnuplot --version gnuplot 4.2 patchlevel 6 The correct error was presented when producing plots. --- I have automated: make clean cvs update configure make make install Other tests would follow (but still expploring) (No success in having the results passed to Testlink) (Using CentOS 6.4 in an i686 machine) Hélio