libvpx

• For PHP suitable sources and up-to-date information see https://github.com/winlibs/libvpx
• Common tools used to compile PHP
• yasm
• cygwin

To compile libxpm the VS projects have to be generated first, follow the instructions under the libvpx project page. PHP uses the static libvpx linked with the static VC runtime. Note that the VS project files are generated with make under Cygwin and empirically the paths in the project files are often Cygwin paths, so they might need correction.

Open in the generated vpx.sln solution in visual studio and compile the vpx project.