Add gui-lib as a dependency.

info.rkt

@@ -1,7 +1,8 @@
 #lang info
 (define collection "pollen")
 (define deps '("base" "txexpr" "sugar" ("markdown" #:version "0.18") "htdp"
-               "at-exp-lib" "html-lib" "rackjure" "web-server-lib" "scribble-text-lib" "rackunit-lib"))
+               "at-exp-lib" "html-lib" "rackjure" "web-server-lib" "scribble-text-lib" "rackunit-lib"
+               "gui-lib"))
 (define build-deps '("plot-gui-lib" "scribble-lib" "racket-doc" "rackunit-doc" "plot-doc" "scribble-doc" "slideshow-doc" "web-server-doc"))
 (define update-implies '("txexpr" "sugar"))
 (define scribblings '(("scribblings/pollen.scrbl" (multi-page))))