diff --git a/libft/Makefile b/libft/Makefile
index 060feedc..0b7088f5 100644
--- a/libft/Makefile
+++ b/libft/Makefile
@@ -215,7 +215,7 @@ SRCS		=	$(addprefix $(SRC_DIR), $(SRC_BASE))
 OBJS		=	$(addprefix $(OBJ_DIR), $(SRC_BASE:.c=.o))
 NB			=	$(words $(SRC_BASE))
 INDEX		=	0
-SHELL		:=	bash
+SHELL		:=	/bin/bash
 
 all :
 	@$(MAKE) -j $(NAME)
@@ -235,7 +235,7 @@ $(OBJ_DIR)%.o :	$(SRC_DIR)%.c | $(OBJ_DIR)
 	@$(eval COLOR=$(shell list=(160 196 202 208 215 221 226 227 190 154 118 82 46); index=$$(($(PERCENT) * $${#list[@]} / 100)); echo "$${list[$$index]}"))
 	@printf "\r\033[38;5;%dm⌛ [%s]: %2d%% `printf '█%.0s' {0..$(DONE)}`%*s❙%*.*s\033[0m\033[K" $(COLOR) $(NAME) $(PERCENT) $(TO_DO) "" $(DELTA) $(DELTA) "$(shell echo "$@" | sed 's/^.*\///')"
 	@$(CC) $(FLAGS) -MMD -c $< -o $@\
-		-I $(INC_DIR)
+		-I $(INC_DIR) -lm
 	@$(eval INDEX=$(shell echo $$(($(INDEX)+1))))
 
 clean :
diff --git a/libft/includes/error.h b/libft/includes/error.h
index 64f16559..3780ad8f 100644
--- a/libft/includes/error.h
+++ b/libft/includes/error.h
@@ -17,7 +17,7 @@
 # include <stdarg.h>
 
 /*
-** DEBUG with no malloc
+** DEBUG with malloc
 */
 # define DG_MSG		"{inv}{ran}%5i{yel}%21s {bol}{blu}%-3d{eoc}"
 # define DG_ARGS	getpid(), getpid(), ft_path_notdir(__FILE__), __LINE__
diff --git a/libft/includes/net.h b/libft/includes/net.h
index c339753b..f6add720 100644
--- a/libft/includes/net.h
+++ b/libft/includes/net.h
@@ -11,6 +11,7 @@
 
 int		create_server(int port, int backlog, char *protoname);
 int		create_client(char *addr, int port, char *protoname);
+void	listener(int domain, int sock, int proto, void (*handler)(void *buf, int bytes, struct sockaddr_in *addr));
 
 int		net_send(int sock, char *msg, int size);
 int		net_get(int sock, char *msg, int size);
diff --git a/libft/srcs/net/create_client.c b/libft/srcs/net/create_client.c
index 77411380..dfc2628a 100644
--- a/libft/srcs/net/create_client.c
+++ b/libft/srcs/net/create_client.c
@@ -16,3 +16,28 @@ int		create_client(char *addr, int port, char *protoname)
 		return (-1);
 	return (sock);
 }
+
+void	listener(int domain, int sock, int proto, void (*handler)(void *buf, int bytes, struct sockaddr_in *addr))
+{	int sd;
+	struct sockaddr_in addr;
+	unsigned char buf[1024];
+
+	sd = socket(domain, sock, proto);
+	if (sd < 0)
+	{
+		perror("listener socket");
+		exit(0);
+	}
+	for (;;)
+	{	int bytes;
+		socklen_t len=sizeof(addr);
+
+		bzero(buf, sizeof(buf));
+		bytes = recvfrom(sd, buf, sizeof(buf), 0, (struct sockaddr*)&addr, &len);
+		if (bytes > 0 && handler)
+				handler(buf, bytes, &addr);
+		else
+			perror("recvfrom");
+	}
+	exit(0);
+}
diff --git a/libft/srcs/rs/rs.c b/libft/srcs/rs/rs.c
index 3f738785..3cddd3ef 100644
--- a/libft/srcs/rs/rs.c
+++ b/libft/srcs/rs/rs.c
@@ -1,6 +1,7 @@
 #include "libft.h"
 #include <math.h>
 
+double sqrt(double x);
 struct s_stats g_rs = {0, 0, 0, 0, 0, 0, 0};
 
 void	rs_clear()
@@ -32,8 +33,8 @@ void	rs_push(double n)
 
 void	rs_calcmore()
 {
-	void	*libm;
-	double	(*sqrt)(double);
+	/* void	*libm; */
+	/* double	(*sqrt)(double); */
 
 	if (g_rs.count == 0)
 	{
@@ -47,10 +48,10 @@ void	rs_calcmore()
 		return ;
 	}
 	g_rs.var = g_rs.m / (g_rs.count - 1);
-	if ((libm = dlopen("libm.dylib", 0)) == NULL)
-		printf("%s\n", dlerror());
-	else if ((sqrt = dlsym(libm, "sqrt")) == NULL)
-		printf("%s\n", dlerror());
-	else
-		g_rs.stdev = sqrt(g_rs.var);
+	/* if ((libm = dlopen("libm.dylib", 0)) == NULL) */
+	/* 	printf("%s\n", dlerror()); */
+	/* else if ((sqrt = dlsym(libm, "sqrt")) == NULL) */
+	/* 	printf("%s\n", dlerror()); */
+	/* else */
+	g_rs.stdev = sqrt(g_rs.var);
 }