diff --git a/.gitignore b/.gitignore
index ea5b1d9..0a437a2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,4 @@
 first
 *.rom
 make.deps
+gmon.out
diff --git a/Makefile b/Makefile
index b7b0aca..7545a80 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,6 @@
 QUIET=1
+PROFILING=1
+ADDRESS_SANITIZE=1
 
 all:first
 
@@ -22,11 +24,23 @@ else
        Q            =
 endif
 
+ifeq "${PROFILING}" "1"
+	CFLAGS += -pg
+	LDFLAGS += -pg
+endif
+ifeq "${ADDRESS_SANITIZE}" "1"
+	CFLAGS += -fsanitize=address -ggdb
+	LDFLAGS += -fsanitize=address -fsanitize=undefined -fsanitize=leak
+endif
+
 all:${MAIN_ROM}
 
 first: ${OBJECT_FILES}
 	${QUIET_LINK}
-	${Q}gcc -ggdb $^ -fsanitize=address -fsanitize=undefined -fsanitize=leak  -lncursesw -ltinfow -lm -o $@
+	${Q}gcc -ggdb $^ -lncursesw -ltinfow -lm -o $@ ${LDFLAGS}
+
+gprof:
+	gprof first -b|less
 
 %.rom:%.asm first
 	$(QUIET_FAS)
@@ -34,9 +48,9 @@ first: ${OBJECT_FILES}
 
 %.o:%.c
 	${QUIET_CC}
-	${Q}gcc -ggdb -c $< -Wall -Wextra -Werror -fsanitize=address
+	${Q}gcc -c $< -Wall -Wextra -Werror ${CFLAGS}
 
 .PHONY: clean
 clean:
 	${QUIET_CLEAN}
-	${Q} rm -f ${OBJECT_FILES} first ${ROMS}
+	${Q} rm -f ${OBJECT_FILES} first ${ROMS} gmon.out