CMakeLists.txt

@@ -1186,12 +1186,6 @@ get_data_destination(dest_data)
 list(APPEND tmp_vi "  LyX files dir:           ${CMAKE_INSTALL_PREFIX}/${dest_data}")
 string(REPLACE ";" "\\n" VERSION_INFO "${tmp_vi}")
 
-find_library(XCB_LIBRARY NAMES xcb)
-if (XCB_LIBRARY)
-  set(HAVE_LIBXCB 1 CACHE BOOL "" FORCE)
-else()
-  set(HAVE_LIBXCB 0 CACHE BOOL "" FORCE)
-endif()
 configure_file(${LYX_CMAKE_DIR}/config.h.cmake ${TOP_BINARY_DIR}/config.h)
 unset(opts)
 unset(tmp_vi)

development/cmake/ConfigureChecks.cmake

@@ -28,7 +28,7 @@ test_big_endian(WORDS_BIGENDIAN)
 set(Include_Defines)
 foreach(_h_file aspell.h aspell/aspell.h limits.h locale.h
 	stdlib.h sys/stat.h sys/time.h sys/types.h sys/utime.h
-	sys/socket.h unistd.h inttypes.h utime.h string.h argz.h xcb/xcb.h)
+	sys/socket.h unistd.h inttypes.h utime.h string.h argz.h)
 	string(REGEX REPLACE "[/\\.]" "_" _hf ${_h_file})
 	string(TOUPPER ${_hf} _HF)
 	check_include_files(${_h_file} HAVE_${_HF})

development/cmake/config.h.cmake

@@ -91,13 +91,10 @@ ${Include_used_spellchecker}
 // Define to 1 if enchant is version 2.x at least
 #cmakedefine HAVE_ENCHANT2 1
 
-// Define to 1 if have xcb library
-#cmakedefine HAVE_LIBXCB ${HAVE_LIBXCB}
+#endif // config.h guard
 
 #define MYTHES_H_LOCATION <${MYTHES_DIR}/mythes.hxx>
 
-#endif // config.h guard
-
 // Unguarded cleanup of global namespace:
 
 #ifdef ColorMode

src/CMakeLists.txt

@@ -148,6 +148,7 @@ if(QT_USES_X11)
   find_package(X11 REQUIRED)
   target_link_libraries(${_lyx} ${X11_X11_LIB}) # we need it because we use XSendEvent
   if(HAVE_QT5_X11_EXTRAS)
+    find_library(XCB_LIBRARY NAMES xcb)
     if (XCB_LIBRARY MATCHES "NOTFOUND")
       message(FATAL_ERROR "Need xcb library to use with QT5_X11_EXTRAS")
     endif()