diff --git a/Makefile b/Makefile
index f5ccd36..9b67e1b 100644
--- a/Makefile
+++ b/Makefile
@@ -16,7 +16,7 @@ INCLUDE = -I ./include -I lib/gamacon/include -I lib/gamacon/lib/xmlparser/inclu
 CFLAGS = $(INCLUDE) -Wall -Wshadow -Wextra
 
 LDFLAGS = -L lib/gamacon -L lib/my -L lib/xmlparser -L lib/quadtree\
--lgamacon -lxmlparser -lquadtree -lmy -lcsfml-system -lcsfml-graphics -lcsfml-window
+-lgamacon -lxmlparser -lquadtree -lmy -lcsfml-system -lcsfml-graphics -lcsfml-window -lm
 
 NAME = my_runner
 
diff --git a/lib/gamacon b/lib/gamacon
index 167945c..c5f8ad7 160000
--- a/lib/gamacon
+++ b/lib/gamacon
@@ -1 +1 @@
-Subproject commit 167945ccffd58fda6d104a41f77b0d6776f56105
+Subproject commit c5f8ad7935ccbf22530248da6a7e8cdc18ef6ffb