The version of glew in the repos is currently 1.12, more than eighteen months old. There have been three releases since, including a major version bump. The last release was a few days ago.
The 2.0.0 release adds support for forward-compatible contexts, OSMesa, and EGL, and many new extensions. The 2.1.0 release adds support for OpenGL 4.6. 2.1.0 might be considered too recent for inclusion, but 2.0.0 should be considered stable.
Link to latest (2.1.0) source: https://sourceforge.net/projects/glew/files/glew/2.1.0/glew-2.1.0.tgz/download