diff --git a/hmmlib/hmmlib.h b/hmmlib/hmmlib.h
index 2703243..8c89cc5 100644
--- a/hmmlib/hmmlib.h
+++ b/hmmlib/hmmlib.h
@@ -1,8 +1,6 @@
 #ifndef HMML_H_
 #define HMML_H_
-#include <stdint.h>
 #include <stddef.h>
-#include <stdbool.h>
 #include <stdio.h>
 
 // Data structures
@@ -81,7 +79,7 @@ typedef struct {
 	size_t marker_count;
 
 	HMML_Quote quote;
-	bool is_quote;
+	_Bool is_quote;
 } HMML_Annotation;
 
 typedef struct {
@@ -90,7 +88,7 @@ typedef struct {
 } HMML_Error;
 
 typedef struct {
-	bool               well_formed;
+	_Bool               well_formed;
 	HMML_VideoMetaData metadata;
 	HMML_Annotation*   annotations;
 	size_t             annotation_count;
diff --git a/hmmlib/makefile b/hmmlib/makefile
index 558949f..12b29dc 100644
--- a/hmmlib/makefile
+++ b/hmmlib/makefile
@@ -8,3 +8,8 @@ hmmlib.o: hmmlib.c
 
 example: example.c hmml.a
 	gcc -g $^ -o $@
+	
+clean:
+	$(RM) hmml.a hmmlib.o example
+
+.PHONY: clean