New in version 3.12.
This is a CMake Environment Variable. Its initial value is taken from the calling process environment.
Calls to find_package() will search in prefixes specified by the
<PackageName>_ROOT environment variable, where
<PackageName> is the name given to the find_package() call and
_ROOT is literal. For example,
find_package(Foo) will search prefixes specified in the
Foo_ROOT environment variable (if set). See policy CMP0074.
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 _ROOT CMake variable.
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