$OpenBSD$
--- Makefile.in.orig	Mon Feb 24 22:07:13 2014
+++ Makefile.in	Mon Feb 24 22:09:12 2014
@@ -360,7 +360,7 @@ LIBLTDL = @LIBLTDL@
 LIBOBJS = @LIBOBJS@
 LIBOPENGL = @LIBOPENGL@
 LIBREADLINE = @LIBREADLINE@
-LIBS = @LIBS@
+LIBS = @LIBS@ -lpthread -lexecinfo
 LIBSIGSEGV = @LIBSIGSEGV@
 LIBSNPRINTFV = @LIBSNPRINTFV@
 LIBTCLTK = @LIBTCLTK@
