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d4e43c7b69
`pkg_check_modules()` seems to leave `<PACKAGE>_VERSION` defined with an empty value, if the package is not found. When the package is also not found in the fallback branch, `find_package_handle_standard_args()` logs and error message. In this message it includes the bogus empty value as: `(found version "")`: ``` Could NOT find Libgcrypt (missing: LIBGCRYPT_INCLUDE_DIR LIBGCRYPT_LIBRARY) (found version "") ``` Clear the version number to avoid the confusion: ``` Could NOT find Libgcrypt (missing: LIBGCRYPT_INCLUDE_DIR LIBGCRYPT_LIBRARY) ``` Seen with CMake v3.30.3 and 3.30.5. Closes #1479