diff --git a/lib/libpvf/adpcm.h b/lib/libpvf/adpcm.h
new file mode 100644
index 0000000..21086b6
--- /dev/null
+++ b/lib/libpvf/adpcm.h
@@ -0,0 +1,21 @@
+/*
+** adpcm.h - include file for adpcm coder.
+**
+** Version 1.0, 7-Jul-92.
+*/
+
+struct adpcm_state {
+    short valprev;  /* Previous output value */
+    char  index;         /* Index into stepsize table */
+};
+
+#ifdef __STDC__
+#define ARGS(x) x
+#else
+#define ARGS(x) ()
+#endif
+
+#if 0
+void adpcm_coder ARGS((short [], char [], int, struct adpcm_state *));
+void adpcm_decoder ARGS((char [], short [], int, struct adpcm_state *));
+#endif
diff --git a/lib/libpvf/bitsizes.h b/lib/libpvf/bitsizes.h
new file mode 100644
index 0000000..629ac75
--- /dev/null
+++ b/lib/libpvf/bitsizes.h
@@ -0,0 +1,21 @@
+/*
+ * bitsizes.h
+ *
+ * Declaration for variable types with defined bit sizes
+ *
+ * $Id: bitsizes.h,v 1.4 1998/09/09 21:06:32 gert Exp $
+ *
+ */
+
+typedef short              vgetty_s_int16;
+typedef unsigned short     vgetty_u_int16;
+typedef int                vgetty_s_int32;
+typedef unsigned int       vgetty_u_int32;
+
+#ifdef linux
+ typedef int64_t            vgetty_s_int64;
+ typedef u_int64_t          vgetty_u_int64;
+#else
+ typedef long long          vgetty_s_int64;
+ typedef unsigned long long vgetty_u_int64;
+#endif