Birdfont is a free font editor which lets you create vector graphics and export TTF, OTF and SVG fonts. The editor has good support for both monochrome and color font formats. Version 2.33.3 is the latest can be installed in Slackware 15.0 because earlier versions require webkit2gtk4.1. Since the build of Birdfont is based on vala and the version 0.54 available in Slackware 15.0 does not create the APIs for webkit2gtk 4.1, the build of version earlier than 2.33.3 will fail.