qt-everywhere-src-5.14.1/qtbase/mkspecs/features/egl.prf

INCLUDEPATH += $$QMAKE_INCDIR_EGL
LIBS_PRIVATE += $$QMAKE_LIBS_EGL
QMAKE_CFLAGS += $$QMAKE_CFLAGS_EGL
QMAKE_CXXFLAGS += $$QMAKE_CFLAGS_EGL
DEFINES += $$QMAKE_DEFINES_EGL
LIBS += $$QMAKE_LFLAGS_EGL
for(p, QMAKE_LIBDIR_EGL) {
    LIBS_PRIVATE += -L$$p
}