diff --git a/src/runtime/plugins/CMakeLists.txt b/src/runtime/plugins/CMakeLists.txt
--- a/src/runtime/plugins/CMakeLists.txt
+++ b/src/runtime/plugins/CMakeLists.txt
@@ -1,4 +1,4 @@
-if (${XCB_XCB_FOUND} AND ${XCB_KEYSYMS_FOUND} AND ${XCB_XKB_FOUND})
+if (XCB_XCB_FOUND AND XCB_KEYSYMS_FOUND AND XCB_XKB_FOUND)
     add_subdirectory(xcb)
 endif()
 # if (APPLE)