diff -Naur soundmodem-0.20/newqpsk/filter.c soundmodem-0.20-mod/newqpsk/filter.c
--- soundmodem-0.20/newqpsk/filter.c	2002-08-09 22:14:35.000000000 +0200
+++ soundmodem-0.20-mod/newqpsk/filter.c	2016-02-17 18:48:32.131907738 +0100
@@ -6,6 +6,24 @@
 #include "modemconfig.h"
 #include "filter.h"
 
+#ifdef __i386__
+#define __HAVE_ARCH_MAC
+#include "filter-i386.h"
+#endif                /* __i386__ */
+
+#ifndef __HAVE_ARCH_MAC
+#define __HAVE_ARCH_MAC
+only_inline float mac(const float *a, const float *b, unsigned int size)
+{
+	float sum = 0;
+	unsigned int i;
+
+	for (i = 0; i < size; i++)
+		sum += (*a++) * (*b++);
+	return sum;
+}
+#endif                                /* __HAVE_ARCH_MAC */
+
 #include <stdio.h>
 #include <string.h>
 
diff -Naur soundmodem-0.20/newqpsk/filter.h soundmodem-0.20-mod/newqpsk/filter.h
--- soundmodem-0.20/newqpsk/filter.h	2015-05-04 19:50:06.000000000 +0200
+++ soundmodem-0.20-mod/newqpsk/filter.h	2016-02-17 18:48:54.477749461 +0100
@@ -5,26 +5,6 @@
 
 /* ---------------------------------------------------------------------- */
 
-#ifdef __i386__
-#include "filter-i386.h"
-#endif				/* __i386__ */
-
-/* ---------------------------------------------------------------------- */
-
-#ifndef __HAVE_ARCH_MAC
-only_inline float mac(const float *a, const float *b, unsigned int size)
-{
-	float sum = 0;
-	unsigned int i;
-
-	for (i = 0; i < size; i++)
-		sum += (*a++) * (*b++);
-	return sum;
-}
-#endif				/* __HAVE_ARCH_MAC */
-
-/* ---------------------------------------------------------------------- */
-
 struct filter {
 	float filtI[NumFilters][AliasFilterLen];
 	float filtQ[NumFilters][AliasFilterLen];