diff --git a/mkspecs/common/linux.conf b/mkspecs/common/linux.conf
index 143df704b1d..28af74b491d 100644
--- a/mkspecs/common/linux.conf
+++ b/mkspecs/common/linux.conf
@@ -45,10 +45,6 @@ QMAKE_LIBDIR_WAYLAND    =
 QMAKE_DEFINES_WAYLAND   =
 QMAKE_WAYLAND_SCANNER   = wayland-scanner
 
-QMAKE_CFLAGS_XCB        =
-QMAKE_LIBS_XCB          =
-QMAKE_DEFINES_XCB       =
-
 QMAKE_AR                = ar cqs
 QMAKE_OBJCOPY           = objcopy
 QMAKE_NM                = nm -P
diff --git a/mkspecs/hurd-g++/qmake.conf b/mkspecs/hurd-g++/qmake.conf
index f2e32426273..fc6ef779fc6 100644
--- a/mkspecs/hurd-g++/qmake.conf
+++ b/mkspecs/hurd-g++/qmake.conf
@@ -36,10 +36,6 @@ QMAKE_LIBS_OPENGL_ES2   = -lGLESv2
 QMAKE_LIBS_OPENVG       = -lOpenVG
 QMAKE_LIBS_THREAD       = -lpthread
 
-QMAKE_CFLAGS_XCB        =
-QMAKE_LIBS_XCB          =
-QMAKE_DEFINES_XCB       =
-
 QMAKE_AR                = ar cqs
 QMAKE_OBJCOPY           = objcopy
 QMAKE_NM                = nm -P