diff --git a/include/common.h b/include/common.h
index 1f45ebe0..70f5399c 100644
--- a/include/common.h
+++ b/include/common.h
@@ -1,6 +1,8 @@
 #ifndef _COMMON_H_
 #define _COMMON_H_
 
-void OSReport(const char * format, ...);
+#include "types.h"
+#include "common_structs.h"
+#include "functions.h"
 
 #endif
\ No newline at end of file
diff --git a/include/common_structs.h b/include/common_structs.h
new file mode 100644
index 00000000..19a73ff0
--- /dev/null
+++ b/include/common_structs.h
@@ -0,0 +1,12 @@
+#ifndef _COMMON_STRUCTS_H
+#define _COMMON_STRUCTS_H
+
+#include "types.h"
+
+typedef struct UnkOvl {
+    s32 unk0;
+    char unk4[4];
+    s32 unk8;
+} UnkOvl;
+
+#endif
\ No newline at end of file
diff --git a/include/functions.h b/include/functions.h
new file mode 100644
index 00000000..4f81af72
--- /dev/null
+++ b/include/functions.h
@@ -0,0 +1,17 @@
+#ifndef _FUNCTIONS_H_
+#define _FUNCTIONS_H_
+
+#include "types.h"
+#include "common_structs.h"
+
+void OSReport(const char * format, ...);
+void *HuPrcCreate(void (*), s32, s32, s32);
+void Hu3DBGColorSet(u8, u8, u8);
+void Hu3DCameraCreate(s16);
+void Hu3DCameraPerspectiveSet(s16, f32, f32, f32, f32);
+void Hu3DCameraViewportSet(s16, f32, f32, f32, f32, f32, f32);
+void omOvlHisChg(s32, s32, s32, s32);
+UnkOvl* omOvlHisGet(s32);
+void * omInitObjMan(s32, s32);
+
+#endif
\ No newline at end of file
diff --git a/include/types.h b/include/types.h
new file mode 100644
index 00000000..71c28167
--- /dev/null
+++ b/include/types.h
@@ -0,0 +1,23 @@
+#ifndef _TYPES_H_
+#define _TYPES_H_
+
+typedef unsigned char u8;
+typedef unsigned short u16;
+typedef unsigned long u32;
+typedef unsigned long long u64;
+typedef signed char s8;
+typedef short s16;
+typedef long s32;
+typedef long long s64;
+typedef volatile unsigned char vu8;
+typedef volatile unsigned short vu16;
+typedef volatile unsigned long vu32;
+typedef volatile unsigned long long vu64;
+typedef volatile signed char vs8;
+typedef volatile short vs16;
+typedef volatile long vs32;
+typedef volatile long long vs64;
+typedef float f32;
+typedef double f64;
+
+#endif
\ No newline at end of file