• Update to version 2.77a
• Switch to SDL2 as dependency, if the SDL option is set. Blender's dependency detection favours SDL2 over SDL
• Fix some missing LIB_DEPENDS
• Make boost a default dependency for Blender. Too many optional features depend on it
• Include the libc++ 3.8.0 fix from PR 209614

Blender 2.77 comes with hundreds of bug fixes and many new features,
such as

• improved subsurface scattering and GPU support for cycles
• improved sculpting workflows
• better antialiasing for OpenGL renderers in the UI
• speedups for the gaussian blur effect in the sequencer
• improved weight-painting behaviour
• and many more

Changelog: https://wiki.blender.org/index.php/Dev:Ref/Release_Notes/2.77