Add FAQ text about Makefile.custom:

<P><I>src/Makefile.custom</I> can be used to set environment variables,
    like <I>CUSTOM_COPT</I>, that are used for every compile.

doc/FAQ_DEV

@@ -1,7 +1,7 @@
 
           Developer's Frequently Asked Questions (FAQ) for PostgreSQL
                                        
-   Last updated: Thu Jan 4 16:00:00 EST 2007
+   Last updated: Mon Feb 19 18:44:29 EST 2007
    
    Current maintainer: Bruce Momjian (bruce@momjian.us)
    
@@ -77,11 +77,14 @@ General Questions
    Some developers use compilers from other software vendors with mixed
    results.
    
-   Developers who are regularly rebuilding the source often pass the
+   Developers who regularly rebuild the source often pass the
    --enable-depend flag to configure. The result is that when you make a
    modification to a C header file, all files depend upon that file are
    also rebuilt.
    
+   src/Makefile.custom can be used to set environment variables, like
+   CUSTOM_COPT, that are used for every compile.
+   
   1.3) What areas need work?
   
    Outstanding features are detailed in the TODO list. This is located in

doc/src/FAQ/FAQ_DEV.html

@@ -13,7 +13,7 @@
     <H1>Developer's Frequently Asked Questions (FAQ) for
     PostgreSQL</H1>
 
-    <P>Last updated: Thu Jan  4 16:00:00 EST 2007</P>
+    <P>Last updated: Mon Feb 19 18:44:29 EST 2007</P>
 
     <P>Current maintainer: Bruce Momjian (<A href=
     "mailto:bruce@momjian.us">bruce@momjian.us</A>)<BR>
@@ -120,10 +120,13 @@
     <P>Some developers use compilers from other software vendors with
     mixed results.</P>
 
-    <P>Developers who are regularly rebuilding the source often pass
-    the --enable-depend flag to <I>configure</I>. The result is that
-    when you make a modification to a C header file, all files depend
-    upon that file are also rebuilt.</P>
+    <P>Developers who regularly rebuild the source often pass the
+    --enable-depend flag to <I>configure</I>. The result is that when you
+    make a modification to a C header file, all files depend upon that
+    file are also rebuilt.</P>
+
+    <P><I>src/Makefile.custom</I> can be used to set environment variables,
+    like <I>CUSTOM_COPT</I>, that are used for every compile.
 
     <H3 id="item1.3">1.3) What areas need work?</H3>
     Outstanding features are detailed in the TODO list. This is located