--- grc_usrp.m4.orig	2007-05-06 10:47:05.000000000 +0930
+++ grc_usrp.m4	2007-05-06 10:58:54.000000000 +0930
@@ -51,7 +51,7 @@
 
     # These checks don't fail
     AC_C_BIGENDIAN
-    AC_CHECK_HEADERS([byteswap.h linux/compiler.h])
+    AC_CHECK_HEADERS([byteswap.h sys/bswap.h linux/compiler.h])
     AC_CHECK_FUNCS([getrusage sched_setscheduler])
     AC_CHECK_FUNCS([sigaction snprintf])