FPHSA already does this.
@@ -53,7 +53,6 @@ find_package_handle_standard_args(LibArchive
REQUIRED_VARS LibArchive_LIBRARY LibArchive_INCLUDE_DIR
VERSION_VAR LibArchive_VERSION
)
-set(LibArchive_FOUND ${LIBARCHIVE_FOUND})
unset(LIBARCHIVE_FOUND)
if(LibArchive_FOUND)