files location are
$\mkspecs\modules\qt_lib_gui_private.pri
$\mkspecs\modulesqt_lib_network_private.pri

I have my "build qt machine"(named A) and "dev app based on qt machine"(named B), every thing works well on A and when I copy whole qt to B. my app cannot be built.
A and B has same Qt path, but not same GCC/MinGW Path

qt_lib_gui_private.pri have following line

QMAKE_LIBS_DXGI = q:/gcc/mingw64/lib/libdxgi.a
QMAKE_LIBS_D3D11 = q:/gcc/mingw64/lib/libd3d11.a
QMAKE_LIBS_D2D1 = q:/gcc/mingw64/lib/libd2d1.a
QMAKE_LIBS_D2D1_1 = q:/gcc/mingw64/lib/libd2d1.a
QMAKE_LIBS_DXGI1_2 = q:/gcc/mingw64/lib/libdxgi.a
QMAKE_LIBS_D3D11_1 = q:/gcc/mingw64/lib/libd3d11.a
QMAKE_LIBS_D3D9 = q:/gcc/mingw64/lib/libd3d9.a
QMAKE_LIBS_DWRITE = q:/gcc/mingw64/lib/libdwrite.a
QMAKE_LIBS_DWRITE_1 = q:/gcc/mingw64/lib/libdwrite.a
QMAKE_LIBS_DWRITE_2 = q:/gcc/mingw64/lib/libdwrite.a
QMAKE_LIBS_DXGUID = q:/gcc/mingw64/lib/libdxguid.a
QMAKE_LIBS_OPENGL = q:/gcc/mingw64/lib/libglu32.a q:/gcc/mingw64/lib/libopengl32.a q:/gcc/mingw64/lib/libgdi32.a q:/gcc/mingw64/lib/libuser32.a

and qt_lib_network_private.pri has

QMAKE_LIBS_NETWORK = q:/gcc/mingw64/lib/libws2_32.a

all these follow the machine A, but when build on machine B, paths do not exists.

comment/delete these lines, qt build back works

this is regression issue and Qt 5.12.0 did not have this issue.