Revert mention that HTML documentation has to be built first.

Now require gmake 3.79.1 or later to build source/sgml.

doc/src/sgml/docguide.sgml

-<!-- $PostgreSQL: pgsql/doc/src/sgml/docguide.sgml,v 1.79 2010/01/22 15:49:29 momjian Exp $ -->
+<!-- $PostgreSQL: pgsql/doc/src/sgml/docguide.sgml,v 1.80 2010/01/22 22:50:03 momjian Exp $ -->
 
 <appendix id="docguide">
  <title>Documentation</title>
@@ -590,8 +590,7 @@ gmake man
 
    <para>
     If you want to use <application>JadeTex</application> to produce a
-    printable rendition of the documentation, you must first build the
-    <acronym>HTML</acronym> output as outlined above, then you can use one of the
+    printable rendition of the documentation, you can use one of the
     following commands:
 
     <itemizedlist>

doc/src/sgml/installation.sgml

-<!-- $PostgreSQL: pgsql/doc/src/sgml/installation.sgml,v 1.338 2010/01/16 20:38:54 mha Exp $ -->
+<!-- $PostgreSQL: pgsql/doc/src/sgml/installation.sgml,v 1.339 2010/01/22 22:50:03 momjian Exp $ -->
 
 <chapter id="installation">
  <title><![%standalone-include[<productname>PostgreSQL</>]]>
@@ -79,7 +79,7 @@ su - postgres
 <screen>
 <userinput>gmake --version</userinput>
 </screen>
-      It is recommended to use version 3.76.1 or later.
+      It is recommended to use version 3.79.1 or later.
      </para>
     </listitem>