• Add missing dependency on qt corelib
• Fix dependency on python: require 2.7, fails with python3:

bindings/python/qrosspython/cxx/IndirectPythonInterface.cxx:469:12: error: unknown type name 'DL_IMPORT'
extern "C" DL_IMPORT(PyTypeObject) PyRange_Type;

^

bindings/python/qrosspython/cxx/IndirectPythonInterface.cxx:469:35: error: expected ';' after top level declarator
extern "C" DL_IMPORT(PyTypeObject) PyRange_Type;

^
;

bindings/python/qrosspython/cxx/IndirectPythonInterface.cxx:470:34: error: expected function body after function declarator
extern "C" DL_IMPORT(PyObject *) PyRange_New(long, long, long, int);

^

bindings/python/qrosspython/cxx/IndirectPythonInterface.cxx:497:44: error: no member named 'PyExc_MemoryErrorInst' in the global namespace; did you mean '_Exc_MemoryErrorInst'?
PyObject * _Exc_MemoryErrorInst() { return ::PyExc_MemoryErrorInst; }

^~~~~~~~~~~~~~~~~~~~~~~
_Exc_MemoryErrorInst

...

• Fix dependency on py-sip (use flavors to depend on correct version)
• Switch to opt_CMAKE_BOOL

Approved by: portmgr blanket