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Noticed while updating the vcpkg port:
<program>_FOUND
doesn't mean it is found via the usualPATH
environment variable.find_program
searches more thanENV{PATH}
, and it also considers the input (cache) variable. So the variable must actually be used.The variable name is changed to match CMake's
FindLibXslt.cmake
module. But actually using that module is probably too much if only the program is needed.Fixes #1065.