CMake Warning:
  Manually-specified variables were not used by the project:

    ALSOFT_TESTS
    CMAKE_EXPORT_NO_PACKAGE_REGISTRY


/Applications/Xcode-11.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: file: ../lib/libopenal.a(alfstream.cpp.o) has no symbols
/Applications/Xcode-11.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: file: ../lib/libopenal.a(uiddefs.cpp.o) has no symbols
/Applications/Xcode-11.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: file: ../lib/libopenal.a(mixer_sse3.cpp.o) has no symbols
/Applications/Xcode-11.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: file: ../lib/libopenal.a(alfstream.cpp.o) has no symbols
/Applications/Xcode-11.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: file: ../lib/libopenal.a(uiddefs.cpp.o) has no symbols
/Applications/Xcode-11.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: file: ../lib/libopenal.a(mixer_sse3.cpp.o) has no symbols
/Applications/Xcode-11.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: file: /Users/jenkins/w/cci_PR-3658@3/.conan/data/openal/1.21.0/_/_/package/f74366f76f700cc6e991285892ad7a23c30e6d47/lib/libopenal.a(alfstream.cpp.o) has no symbols
/Applications/Xcode-11.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: file: /Users/jenkins/w/cci_PR-3658@3/.conan/data/openal/1.21.0/_/_/package/f74366f76f700cc6e991285892ad7a23c30e6d47/lib/libopenal.a(uiddefs.cpp.o) has no symbols
/Applications/Xcode-11.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: file: /Users/jenkins/w/cci_PR-3658@3/.conan/data/openal/1.21.0/_/_/package/f74366f76f700cc6e991285892ad7a23c30e6d47/lib/libopenal.a(mixer_sse3.cpp.o) has no symbols
CMake Warning:
  Manually-specified variables were not used by the project:

    CMAKE_EXPORT_NO_PACKAGE_REGISTRY


openal/1.21.0: WARN: openal requires a compiler supporting c++14. I don't know whether your compiler does, so I assume it does.