18 - if [ "$TRAVIS_OS_NAME" == "osx" ]; then brew update; fi
19 - if [ "$TRAVIS_OS_NAME" == "osx" ]; then brew outdated pkg-config || brew upgrade pkg-config; fi
20 - if [ "$TRAVIS_OS_NAME" == "osx" ]; then brew install aften; fi
21 - if [ "$TRAVIS_OS_NAME" == "osx" ]; then brew install libsamplerate; fi
22 - if [ "$TRAVIS_OS_NAME" == "osx" ]; then brew install libsndfile; fi
23 - if [ "$TRAVIS_OS_NAME" == "osx" ]; then brew install opus; fi
24 - if [ "$TRAVIS_OS_NAME" == "osx" ]; then brew install readline; fi
27 - if [ "$TRAVIS_OS_NAME" == "linux" ]; then ./waf configure --alsa; fi
28 - if [ "$TRAVIS_OS_NAME" == "osx" ]; then ./waf configure --opus=no --readline=no; fi