These pages are primarily focused towards developers either contributing to the PROJ project or using the library in their own software.
projects.h header and the functions related to it is considered
deprecated from version 5.0.0 and onwards. The header has been removed
PROJ in version 6.0.0 released February 1st 2019.
The nmake build system on Windows is on longer supported in version 6.0.0 on onwards. Use CMake instead.
proj_api.h header and the functions related to it is
considered deprecated from version 5.0.0 and onwards. The header will be
removed from PROJ in version 7.0.0 scheduled for release March 1st
With the introduction of PROJ 5, behavioural changes has been made to existing functionality. Consult Known differences between versions for the details.