Linking error while setting up application'style to QwindowsXP Style.

[jacek]

error LNK2019: unresolved external symbol "public: __thiscall QWindowsStylePrivate::QWindowsStylePrivate(void)" (??0QWindowsStylePrivate@@QAE@XZ) referenced in function "public: __thiscall CustomStylePrivate::CustomStylePrivate(void)" (??0CustomStylePrivate@@QAE@XZ)

QWindowsStylePrivate is not a part of public API and it isn't exported, so you can't use it in your program. Subclass QWindowsStyle instead.