I am using molequeue-0.7.1.tar.gz that I downloaded from the openchemistry.org download page last Friday. I unpacked the code on my linux machine running Qt 4.8.6 and molequeue made with no problems. Avogadrolibs threw an error with Qt5Json.
So I moved the same tar file to another linux box which only has Qt 5.9.1 installed and I get a cmake error: This code requires Qt 4.x. It turns out the CMakeLists.txt in ./thirdparty/qt5json has a find_package(Qt 4.8 Required QtCore). You might not get this error is you have both Qt4 and Qt5 installed on the same system