diff --git a/Makefile b/Makefile
index d59d64f..0fe55ea 100644
--- a/Makefile
+++ b/Makefile
@@ -1,22 +1,23 @@
 CC       = gcc
-CFLAGS   =
+CFLAGS   = -std=gnu11
 CPPFLAGS = -Iinclude -MMD -MP
 
 SRCDIR = src
 
-SRCS = $(wildcard $(SRCDIR)/*.c)
-OBJS = $(patsubst $(SRCDIR)/%.c,%.o,$(SRCS))
-EXE  = gc
+SRCS := $(wildcard $(SRCDIR)/*.c)
+OBJS := $(patsubst $(SRCDIR)/%.c,%.o,$(SRCS))
+EXE   = gc
 
-DBDIR    = debug
-DBEXE    = $(DBDIR)/$(EXE)
-DBOBJS   = $(addprefix $(DBDIR)/, $(OBJS))
-DBCFLAGS = -g -O0 -DDEBUG
+DBDIR     = debug
+DBEXE    := $(DBDIR)/$(EXE)
+DBOBJS   := $(addprefix $(DBDIR)/, $(OBJS))
+DBCFLAGS  = -g -O0 -DDEBUG
 
-REDIR    = bin
-REEXE    = $(REDIR)/$(EXE)
-REOBJS   = $(addprefix $(REDIR)/, $(OBJS))
-RECFLAGS = -O3 -Wall -Wextra -Wpedantic -Werror
+
+REDIR     = bin
+REEXE    := $(REDIR)/$(EXE)
+REOBJS   := $(addprefix $(REDIR)/, $(OBJS))
+RECFLAGS  = -O3 -Wall -Wextra -Wpedantic -Werror
 
 .PHONY: all clean debug prep release
 
@@ -43,3 +44,5 @@ prep:
 
 clean:
 	rm -rf $(DBDIR) $(REDIR)
+
+-include $(OBJ:.o=.d)