diff -urNpa spandsp-0.0.2.orig/src/spandsp/fir.h spandsp-0.0.2/src/spandsp/fir.h
--- spandsp-0.0.2.orig/src/spandsp/fir.h	2008-11-29 18:15:03.000000000 +0300
+++ spandsp-0.0.2/src/spandsp/fir.h	2008-11-29 18:15:26.000000000 +0300
@@ -41,6 +41,8 @@
 #include "mmx.h"
 #endif
 
+#include <string.h>
+
 /*!
     16 bit integer FIR descriptor. This defines the working state for a single
     instance of an FIR filter using 16 bit integer coefficients.