Index: head/en_US.ISO8859-1/books/handbook/introduction/chapter.xml
===================================================================
--- head/en_US.ISO8859-1/books/handbook/introduction/chapter.xml
+++ head/en_US.ISO8859-1/books/handbook/introduction/chapter.xml
@@ -140,25 +140,8 @@
 	      <primary>binary compatibility</primary>
 	      <secondary>Linux</secondary>
 	    </indexterm>
-	    <indexterm>
-	      <primary>binary compatibility</primary>
-	      <secondary>SCO</secondary>
-	    </indexterm>
-	    <indexterm>
-	      <primary>binary compatibility</primary>
-	      <secondary>SVR4</secondary>
-	    </indexterm>
-	    <indexterm>
-	      <primary>binary compatibility</primary>
-	      <secondary>BSD/OS</secondary>
-	    </indexterm>
-	    <indexterm>
-	      <primary>binary compatibility</primary>
-	      <secondary>NetBSD</secondary>
-	    </indexterm>
 	    <emphasis>Binary compatibility</emphasis> with many
-	    programs built for Linux, SCO, SVR4, BSDI and
-	    NetBSD.</para>
+	    programs built for Linux.</para>
 	</listitem>
 
 	<listitem>