This is a CMake Environment Variable. Its initial value is taken from the calling process environment.

The CMAKE_PREFIX_PATH environment variable may be set to a list of directories specifying installation prefixes to be searched by the find_package(), find_program(), find_library(), find_file(), and find_path() commands. Each command will add appropriate subdirectories (like bin, lib, or include) as specified in its own documentation.

This variable may hold a single prefix or a list of prefixes separated by : on UNIX or ; on Windows (the same as the PATH environment variable convention on those platforms).

See also the CMAKE_PREFIX_PATH CMake variable.