Otherwise those external projects will fail, because with only VS2013 installed there is no ToolsVersion 4.0 (which is set inside the VC projects files).
http://msdn.microsoft.com/en-us/library/bb383985.aspx
0b684fa VS2013: Override ToolsVersion setting
external/coinmp/ExternalProject_coinmp.mk | 2 +-
external/cppunit/ExternalProject_cppunit.mk | 2 +-
external/libgltf/ExternalProject_libgltf.mk | 2 +-
external/python3/ExternalProject_python3.mk | 2 +-
4 files changed, 4 insertions(+), 4 deletions(-)
Upstream: cgit.freedesktop.org