What do messages about no X11 or png support mean?
As discussed in the previous section, colplot requires png or X11 support to run from a browser or command line respectively. As of version 4.1.0, if you try to run colplot from an environment that doesn’t support that capability it will not run and you will get the associted error message. Additionally, the -version information displayed has been extended to explicitly state the types of graphics supported by gnuplot as addtional confirmation. To proceed you will need to install a version of gnuplot that has been built to support these types of graphics OR build it yourself! If building it yourself note that you will need to install the png-devel package to support png graphics which in turn also requires gd and /gd-devel. X11 graphics will require the installation of xorg-x11-devel as well as supporting packages freetype2-devel and fontconfig-devel.
