Allow to build with the PyPI package "clang" instead of "libclang". 1. It seems to be maintained. 2. In the FreeBSD base system there is no pre-built libclang.so. If you need this library you have to install llvm from ports additionally. 2. On FreeBSD there is no pre-built wheel "libclang" with a packaged libclang.so.

zxing_add_package_stb()

if (ZXING_READERS)
    add_executable (ZXingCTest ZXingCTest.c)
    target_link_libraries (ZXingCTest ZXing::ZXing stb::stb)
    add_test(NAME ZXingCTest COMMAND ZXingCTest ${CMAKE_SOURCE_DIR}/test/samples/qrcode-1/1.png)
endif()