This is a Sublime Text plugin that uses Khronos' reference glslangValidator to validate OpenGL GLSL shaders.
You should install GLSL Validator via Package Control.
Everything should work fine as long as you have a GLSL syntax highlighter installed. You can disable the validation in the settings:
Preferences > Package Settings > GLSL Validator > Settings - Default
This plugin makes use of glslangValidator, a tool provided by the Khronos group. In case of issues, make sure the right binary has the right permissions for your platform.