Steps for building and installing Qt5 for Lazarus Using a quick test project with partial code shown here: unit1.pas I'm using Qt 5.6.2 because that's the version with which Lazarus qt5 interface has been tested. You can experiment with later versions, too. Windows 32-bitUsing MinGW$(LazarusDir): C:\fpcupdeluxe\lazarus $(QtDir): C:\Qt\Qt5.6.2 - download:
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