Clarify the documentation of the --with-ossp-uuid option

configure

@@ -1539,8 +1539,7 @@ Optional Packages:
   --without-readline      do not use GNU Readline nor BSD Libedit for editing
   --with-libedit-preferred
                           prefer BSD Libedit over GNU Readline
-  --with-ossp-uuid        use OSSP UUID library when building
+  --with-ossp-uuid        build contrib/uuid-ossp, requires OSSP UUID library
-                          contrib/uuid-ossp
   --with-libxml           build with XML support
   --with-libxslt          use XSLT support when building contrib/xml2
   --with-system-tzdata=DIR

configure.in

@@ -713,7 +713,7 @@ PGAC_ARG_BOOL(with, libedit-preferred, no,
 #
 # OSSP UUID library
 #
-PGAC_ARG_BOOL(with, ossp-uuid, no, [use OSSP UUID library when building contrib/uuid-ossp])
+PGAC_ARG_BOOL(with, ossp-uuid, no, [build contrib/uuid-ossp, requires OSSP UUID library])
 AC_SUBST(with_ossp_uuid)
 
 

doc/src/sgml/installation.sgml

@@ -861,11 +861,12 @@ su - postgres
        <term><option>--with-ossp-uuid</option></term>
        <listitem>
         <para>
-         Use the <ulink url="http://www.ossp.org/pkg/lib/uuid/">OSSP UUID
+         Build components using the <ulink
-         library</ulink> when building the
+         url="http://www.ossp.org/pkg/lib/uuid/">OSSP UUID
+         library</ulink>.  Specifically, build the
          <![%standalone-include[uuid-ossp]]>
-         <![%standalone-ignore[<xref linkend="uuid-ossp">]]>
+         <![%standalone-ignore[<xref linkend="uuid-ossp">]]> module,
-         module.  The library provides functions to generate
+         which provides functions to generate
          UUIDs.<indexterm><primary>UUID</primary></indexterm>
         </para>
        </listitem>