Information does not pretend to be super useful, but it can help save time when setting up.
We have:
Win10 64 bit
Firebird 2.5 (win32)
Qt Creator 4.2.1
Based on Qt 5.8.0 (MSVC 2015, 32 бита)
mingw32-make.exe -v
GNU Make 4.1
Built for i686-w64-mingw32
System variable PATH containing paths:
E:\Firebird\bin - Firebird installed here
E:\Qt\5.8\mingw53_32\bin
E:\Qt\Tools\mingw530_32\bin
Next:
cd %QTDIR%\qtbase\src\plugins\sqldrivers\ibase
qmake "INCLUDEPATH+=E:/Firebird/include" "LIBS+=E:/Firebird/lib/fbclient_ms.lib" ibase.pro
mingw32-make.exe
mingw32-make.exe install