12 - BUILD_SYSTEM=AUTOTOOLS
21 - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew update && brew bundle; fi
24 - if [[ "$BUILD_SYSTEM" == "AUTOTOOLS" ]] ; then ./autogen.sh && ./configure && make -j2 V=1 distcheck; fi
25 - if [[ "$BUILD_SYSTEM" == "CMAKE" ]] ; then mkdir build && pushd build && cmake -G "Unix Makefiles" -DCMAKE_BUILD_TYPE=Release .. && cmake --build . && popd; fi