I still use Qt Creator for my qmake projects until everything is migrated. It doesn't make sense to add qmake support to LeanCreator because Qt Creator is still available on all platforms and continues to support qmake (at least I have no other information). If people port their projects, they actually don't port to LeanCreator, but to the BUSY build system, which in turn can generate qmake projects in case you want/have to use Qt Creator for some tasks.