Development software for building X Window applications. It typically includes a widget set, X Toolkit Intrinsics (Xt) libraries for managing the widget set and the X Library (Xlib). See X Window.
"X toolkit." YourDictionary, n.d. Web. 17 August 2018. <http://www.yourdictionary.com/x-toolkit>.
X toolkit. (n.d.). Retrieved August 17th, 2018, from http://www.yourdictionary.com/x-toolkit