--- a/Makefile
+++ b/Makefile
@@ -11,7 +11,7 @@
 EDTOB = editor
 EDWOB = editworld
 
-LINLIBS=$(LDLIBS) -lGL
+LINLIBS=$(LDLIBS) -lGL -ldl
 LINEXE = ../lin/moleinvasion
 LINEDT = ../lin/editor
 LINEDW = ../lin/editworld