DOC: doc improvement for PGPRO-1413

Author: Liudmila Mantrova

doc/src/sgml/installation-bin.sgml

@@ -707,11 +707,12 @@ systemctl enable postgrespro-&edn;-&majorversion;.service
   <para>
     To compile programs with <productname>&project;</productname>
     libraries using the <application>pg_config</application> utility shipped
-    with <productname>&project;</productname>, you have to make sure
-    that its path is specified in the <envar>PATH</envar> environment variable before
-    the path to any other <application>pg_config</application> version.
-    If you do not have any other <application>pg_config</application> versions
-    on your system, you can use <xref linkend="pg-wrapper"> provided  in the
+    with <productname>&project;</productname>, make sure it appears before
+    the path to other <application>pg_config</application> versions, if any.
+    Note that on RHEL-based systems <application>pg_config</application>
+    is not added to <envar>PATH</envar> automatically. If you do not
+    have any other <application>pg_config</application> versions
+    on your system, you can use <xref linkend="pg-wrapper"> provided in the
     <filename>postgrespro-&edn;-&majorversion;-client</filename> package to create a symbolic
     link to <application>pg_config</application> in the standard binary directory.
   </para>