Here is the scoop from Matt Weakley on Fedora 22: An issue with modelsim working in Fedora 22 turned out to be because of the freetype library. Go to the index of archived libraries, download their file, copy the libfreetype.so.6 and libfreetype.so.6.3.20 files to another directory, and edit the vsim command, as seen in this link: https://wiki.archlinux.org/index.php/Altera_Design_Software Thanks Matt!