After upgrading to readline 7 >>> package: sys-libs/readline-7.0 * - /lib64/libreadline.so.6 * - /lib64/libreadline.so.6.3 * used by /usr/bin/gnuplot (sci-visualization/gnuplot-5.0.4) But gnuplot currently only assumes :0 , not :0= grep 'readline:' * gnuplot-4.6.5.ebuild: readline? ( sys-libs/readline:0 ) gnuplot-5.0.1-r1.ebuild: readline? ( sys-libs/readline:0 ) gnuplot-5.0.3.ebuild: readline? ( sys-libs/readline:0 ) gnuplot-5.0.4.ebuild: readline? ( sys-libs/readline:0 ) gnuplot-5.0.9999.ebuild: readline? ( sys-libs/readline:0 ) gnuplot-5.1.9999.ebuild: readline? ( sys-libs/readline:0 ) changing these to ":0=" should encourage gnuplot to recompile w/ readline upgrades.
Thanks, fixed.