Such arguments are used by "Find-module Packages". However, the Modern
CMake approach for is "Config-file Packages". For expat, GDAL prefers
config (expat-config.cmake, expatConfig.cmake) providing targets named
expat::expat or EXPAT::EXPAT.
To use your own expat, make sure it has a config file which it is
found via the search procedure, or use `EXPAT_ROOT`.
You can read more in the CMake documentation for command
`find_package`, in cmake-packages or in "Using Dependencies Guide".
The more simple hint here to use all custom packages you've installed in
$PREFIX would be to just specify -DCMAKE_PREFIX_PATH=$PREFIX
Even
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