diff --git a/chapter08/libffi.xml b/chapter08/libffi.xml
index 2ed059aa9..82e7e9496 100644
--- a/chapter08/libffi.xml
+++ b/chapter08/libffi.xml
@@ -44,8 +44,10 @@
 
     <note>
       <para>Similar to GMP, libffi builds with optimizations specific
-      to the processor in use. If building for another system, export
-      CFLAGS and CXXFLAGS to specify a generic build for your architecture.
+      to the processor in use. If building for another system, change the
+      value of the <parameter>--with-gcc-arch=</parameter> parameter in the
+      following command to an architecture name fully implemented by the
+      CPU on that system.
       If this is not done, all applications that link to libffi will trigger
       Illegal Operation Errors.</para>
     </note>