diff --git a/doc/mkdocs b/doc/mkdocs
index b291dd41..15ddc74b 100755
--- a/doc/mkdocs
+++ b/doc/mkdocs
@@ -1,7 +1,7 @@
 #!/bin/bash
 ./sgml2html bird.sgml
 ./sgml2latex bird.sgml
-sgml2txt bird.sgml 2> /dev/null
+./sgml2txt bird.sgml
 #> bird.txt
 #for i in bird.html bird-*.html; do 
 #    lynx -dump $i | grep -v 'file://' | grep -v '^References$' >> bird.txt
diff --git a/doc/sbase/dist/birddoc/groff/mapping b/doc/sbase/dist/birddoc/groff/mapping
new file mode 100644
index 00000000..afb81bb4
--- /dev/null
+++ b/doc/sbase/dist/birddoc/groff/mapping
@@ -0,0 +1,653 @@
+% linuxdoc replacement file
+% translates into nroff, using ms macros
+% manpages can be processed using the man macros
+% does not use neqn for math.
+
+% Based on qwertz replacement file by Tom Gordon
+% linuxdoc mods by mdw
+
+% Groff dependencies are few.  To port to another roff: 
+% 1. Check and modify, if necessary, font changes.  (e.g. In psroff the
+% same fonts have other names.)
+% 2. Check the code for including Encapsulated PostScript, generated
+% for eps elements.
+% 3. Also make versions of general.grops and math.grops, which are sed
+% scripts translating character entities into groff character references.
+
+
+<birddoc>	+	".nr PS 11\n"
+
+			% Hacked by mdw
+			".nr PI 3n\n"
+			".ds CF \\\\n\%\n"	
+			".ds CH \\&\n"
+			".ds dR $\n"   % dollar, to avoid EQN conflicts
+
+			% Start with no TOC
+			".ds printtoc\n"
+			
+			% Footnote style
+			".nr FF 1\n"
+
+			% James Clark's trick to prevent unintended paragraph
+			% breaks
+
+			".tr \\&\n"
+
+			% horizontal line
+			".de hl\n"
+			".br\n"
+			"\\l'\\\\n(.lu-\\\\n(.iu'\n"
+			"..\n"
+
+			% paragraph spacing
+			".if n .nr PD 1v\n"
+
+			% margins added by mdw
+                        ".nr PO 0.25i\n"
+			".po 0.25i\n"
+                        ".nr LL 7.0i\n"
+                        ".nr TL 7.0i\n"
+                        ".nr HM 0i\n"
+                        ".nr FM 0i\n"
+
+			% Turn off right-margin filling 
+			".na\n"
+			
+			% h is 1 if first paragraph after heading
+
+			".nr h 0\n" 
+
+			% initialize heading level
+			
+			".nr il 1\n"	
+
+			% Number registers for list
+
+			".nr bi 0\n"  % initialize begin items
+			".nr ll 0\n"  % list level, stores current level
+			".nr el 0\n"  % current enumeration level
+
+			% Not all list levels are enumerations, as 
+			% itemizations can be embedded within enumerations
+			% and vice versa
+			
+			% type of list level is in \n(t\n(ll, where
+			% 0 : itemize, 1 : enumerate, 2: description
+
+			% enumerator for an enumeration level is in
+			% \n(e\n(el -- i.e. \n(e1=2 means current item of
+			% enumeration level 1 is 2
+			
+			% context-sensitive paragraph macro
+
+% Bug: There's some problem using this to re-start paragraphs after the 
+% </verb> and </code>, so after verb and code I insert .LP. That's fine
+% except that is loses indentation when using verb or code inside of a list.
+
+".de Pp\n"
+".ie \\\\n(ll>0 \\{\\\n"   	 % within list?
+".ie \\\\n(bi=1 \\{\\\n"   % first par element of item?
+".nr bi 0\n"	 % reset bi flag
+% if itemization, mark with a bullet
+".if \\\\n(t\\\\n(ll=0 \\{.IP \\\\(bu\\}\n" % itemize
+%  if enumeration: increment and print enumerator
+% for this enumeration level
+".if \\\\n(t\\\\n(ll=1 \\{.IP \\\\n+(e\\\\n(el.\\}\n"
+% if first par element of descrip, do nothing
+".\\}\n"  
+".el .sp \n"		% subsequent par element of item
+".\\}\n"
+".el \\{\\\n"		     	% not within list
+".ie \\\\nh=1 \\{\\\n"	% first par after heading  
+".LP\n"	
+".nr h 0\n"	% reset h flag
+".\\}\n"	        
+".el .LP \n"   % Changed from .PP, mdw
+".\\}\n"
+".nh\n"
+"..\n"	
+
+			
+			
+			% for each level, a number register is created
+			% to store its type and current item number, where
+			% -1=bullet of an itemized list.
+
+			% Format of list level enumerators
+
+			".ds f1 1\n"
+			".ds f2 a\n"
+			".ds f3 i\n"
+			".ds f4 A\n"
+
+			% Number registers for theorems
+			".nr def 0\n"
+			".nr prop 0\n"
+			".nr lemma 0\n"
+			".nr coroll 0\n"
+			".nr proof 0\n"
+			".nr theorem 0\n"
+
+			% Reference commands
+
+% redefine superscript strings so that refer tags look like [this]
+
+			".ds \[. \[\n"
+			".ds .\] \]\n"
+
+</birddoc>
+
+% set initial level of headings, in register il
+
+<article>		+	".nr il 0"		+
+</article>		+	".if '\\*[printtoc]'true' .PX\n" 
+
+<report>		+ 	".nr il 1"		+
+</report>	+	".bp\n"
+			".rm LH\n.rm RH\n"
+			".TC"			+
+
+<book>		+	".nr il 1"		+
+</book>		+	".rm LH\n.rm RH\n"
+			".bp\n"
+			".TC"			+
+
+<notes>		
+</notes>
+
+<manpage>	+	".nr il -1"		+
+</manpage>	
+
+% Hacked up titlepag stuff to look more reasonable. Titles and author
+% names are now stored in strings, printed by the end of </titlepag>.
+% Wake up! This uses groff-like long string names. You must use groff 
+% to format this.
+
+<titlepag>	+	".ds mdwtitle\n"
+			".ds mdwsubtitle\n"
+			".ds mdwdate\n"		
+			".de printabstract\n"
+			"..\n"			+
+</titlepag>	+	"\\*[mdwtitle]\n"
+			".br\n"
+			".if !'\\*[mdwsubtitle]'' \\*[mdwsubtitle]\n"
+			".br\n"
+			".printauthor\n"
+			".br\n"
+			"\\*[mdwdate]\n"
+			".br\n"
+			".printabstract\n"
+			".br\n"	
+
+%<title>		+	".TL"			+
+%</title>	
+
+<title>		+	".ds mdwtitle "
+</title>	+
+
+%<subtitle>	+	".br\n"
+%			".ft R\n"
+%			".SM"		+
+%</subtitle>	+	".LG"			+
+
+<subtitle>	+	".ds mdwsubtitle "	
+</subtitle>	+
+
+<date>		+	".ds mdwdate "	
+</date>		+
+
+<abstract>	+ 	".de printabstract\n"	
+			".LP\n"
+</abstract>	+	".."			+
+
+% author needs to be set up as its own macro, fired off from .printtitle.
+
+<author>	+ 	".de printauthor"	+
+</author>	+	".."			+
+
+%<name>		+	".AU"			+
+%</name>
+
+<name>		+	".br"			+
+</name>
+
+<and>		
+</and>
+
+<thanks>			"\\**\n"	
+			".FS"			+
+</thanks>	+	".FE"			+
+
+<inst>		+	".br"			+
+</inst>
+
+%<newline>	+	".br"			+
+<newline>	+	".br"
+</newline>
+
+<label>		
+</label>	
+
+<header>	
+</header>	
+
+<lhead>		+	".EH '"
+</lhead>		"'''"		+
+
+<rhead>		+	".OH '''"
+</rhead>		"'"			+
+
+<comment>	+	"(*"	+
+</comment>	+	"*)"	+
+
+% New abstract given above --mdw
+%<abstract>	+	".AB"			+
+%</abstract>	+	".AE"			+
+
+<appendix>	+ 	".af H1 A"		+
+</appendix>
+
+% limitation: no list of figures or tables.  A table of contents
+% is always generated for books and reports. Thus these next three tags
+% are no-ops
+
+% For now, no table-of-contents in ASCII output. (Uncomment this if
+% desired).
+%<toc>		+	".ds printtoc true"
+%</toc>
+
+<toc>
+</toc>
+
+<lof>	
+</lof>
+
+<lot>	
+</lot>
+
+<chapt>		+	".bp\n"	
+			".NH \\n(il "		+
+</chapt>
+
+<sect>		+	".NH 1+\\n(il" 		+
+</sect>
+
+<sect1>		+	".NH 2+\\n(il" 	+
+</sect1>
+
+<sect2>		+	".NH 3+\\n(il"		+
+</sect2>
+
+<sect3>		+	".NH 4+\\n(il"		+
+</sect3>	
+
+<sect4>		+	".NH 5+\\n(il"		+
+</sect4>
+
+<heading>		".ds h "
+</heading>	+	"\\*h\n"
+			".XS \\n%\n"
+			"\\*(SN \\*h\n"
+			".XE\n"		
+			".nr h 1\n"  % set heading flag to true
+
+<p>		+	".Pp"			+   
+</p>
+
+<itemize>	+	".nr ll +1\n"	   % increment list level
+			".nr t\\n(ll 0\n"    % set type of level to itemize
+</itemize>	+	".nr ll -1\n"	% decrement list level
+
+<enum>		+	".nr ll +1\n"	    % increment list level
+			".nr el +1\n"	    % increment enumeration level
+			".nr t\\n(ll 1\n"   % set type of level to enum
+			".nr e\\n(el 0 1\n" % initialize enumerator
+			".af e\\n(el \\*(f\\n(el\n" % style of enumerator
+			".if \\n(ll>1 .RS"  +
+</enum>		+	".if \\n(ll>1 .RE\n"
+			".br\n"			
+			".nr el -1\n"	    % decrement enumeration level
+			".nr ll -1\n"	    % decrement list level 
+
+<descrip>	+	".RS\n"
+			".nr ll +1\n"	    % increment list level
+			".nr t\\n(ll 2\n"   % set type of level to descrip
+</descrip>	+	".nr ll -1\n"	    % decrement list level
+			".RE"		+
+
+% number register bi means "begin item".  Used in the .P macro to print
+% bullets or numbers at beginning of first paragraph of an item.
+% If bi=1 then the paragraph is the first one of the item.
+
+<item>		+	".nr bi 1\n.Pp"		+
+</item>	
+
+<tag>		+	".IP \"\\fB"
+</tag>			"\\fR\"\n"
+			".nr bi 1"			+
+
+<m>			""
+</m>			""
+
+<cf>			""
+</cf>			""
+
+<cite>		+	".\[\n[ID]\n.\]"	+
+</cite>	
+
+<ncite>		+	".\[\n[ID]\n.\]\n([NOTE])"
+</ncite>
+
+<footnote>		" (-- "	
+</footnote>		"--)"			+
+
+<sq>			"\\*Q"
+</sq>			"\\*U"
+
+<lq>		+	".RS\n"
+			".nr LL \\n(LL-\\n(PI"	+
+</lq>		+	".nr LL \\n(LL+\\n(PI\n"
+			".RE"			+
+
+<em>			"\\fI"			
+</em>		 	"\\fP"			
+
+<bf>			"\\fB"			
+</bf>			"\\fR"			
+
+<it>			"\\fI"			
+</it>			"\\fR"		
+
+<sf>			"\\fR"		
+</sf>			"\\fR"			
+
+<sl>			"\\fI"		
+</sl>			"\\fR"			
+
+% Changed by mdw
+<tt>			"\\fC"
+</tt>			"\\fR"
+
+% Added by mdw
+<cparam>		"\\fI<"
+</cparam>		">\\fR"
+
+<url>			"[NAME] <\\fC[URL]\\fR>"
+</url>
+
+<htmlurl>		"[NAME]"
+</htmlurl>
+
+<ref>			"``[NAME]''"
+</ref>
+
+<nidx>			+ "\\#"
+</nidx>			  "\\n"
+
+<ncdx>			+ "\\#"
+</ncdx>			  "\\n"
+
+<pageref>		"??"
+</pageref>
+
+<x>	
+</x>
+
+<mc>			
+</mc>
+
+<biblio>	+	".\[\n"
+			"$LIST$\n"
+			".\]"			+
+</biblio>
+
+<code>		+	".DS L\n"
+			".hl\n"
+			".ft R\n"		+
+
+</code>		+	".hl\n"
+			".DE\n"
+			".ft P\n"
+		%	".Pp"	+ % continue previous paragraph (changed mdw)
+			".LP"
+
+<verb>		+	".DS L\n"
+			".ft R\n"		+
+
+</verb>		+	".DE\n"
+			".ft P\n"
+	 	%	".Pp"	+  % continue previous paragraph (changed mdw)
+			".LP"
+
+% tscreen added by mdw 
+<tscreen>       +       ".br\n"
+                        ".po 0.75i\n"
+                        ".ll 6.0i\n"
+                        ".ft C\n"
+                        ".LP\n"         % Used to be Pp
+</tscreen>      +       ".br\n"
+                        ".po 0.25i\n"
+                        ".ll 7.0i\n"
+                        ".ft R\n"       % This might not be correct
+                        ".LP\n"         % Used to be Pp
+
+<quote>         +       ".br\n"
+                        ".po 0.75i\n"
+                        ".ll 6.0i\n"
+                        ".nr LL 6.0i\n"
+                        ".LP\n"         % Used to be Pp
+</quote>        +       ".br\n"
+                        ".po 0.25i\n"
+                        ".ll 7.0i\n"
+                        ".nr LL 7.0i\n"
+                        ".LP\n"         % Used to be Pp
+
+
+
+
+% theorems and such
+
+<def>		+	".sp\n"
+			".nr def \\n\[def\]+1\n"
+			".B \"Definition \\n\[def\] \"" +
+</def>		+	".ft P\n.sp" 		+
+
+<prop>		+	".sp\n"
+			".nr prop \\n\[prop\]+1\n"
+			".B \"Proposition \\n\[prop\] \"" +
+</prop>		+	".ft P\n.sp" 		+
+
+
+<lemma>		+	".sp\n"
+			".nr lemma \\n\[lemma\]+1\n"
+			".B \"Lemma \\n\[lemma\] \""	+
+</lemma>	+	".ft P\n.sp" 		+
+
+<coroll>	+	".sp\n"
+			".nr coroll \\n\[coroll\]+1\n"
+			".B \"Corolloary \\n\[coroll\] \"" +
+</coroll>	+	".ft P\n.sp" 		+
+
+<proof>		+	".sp\n"
+			".nr proof \\n\[proof\]+1\n"
+			".B \"Proof \\n\[proof\] \""	+
+</proof>	+	".ft P\n.sp" 		+
+
+<theorem>	+	".sp\n"
+			".nr theorem \\n\[theorem\]+1\n"
+			".B \"Theorem \\n\[theorem\] \"" +
+</theorem>	+	".ft P\n.sp" 		+
+
+<thtag>		+ 	".B\n("
+</thtag>		")\n.I"			+
+
+% mathematics -- this nroff version needs work.
+
+<f>					
+</f>			
+
+<dm>		+	".DS L"		        +
+</dm>		+	".DE"			+
+
+<eq>		+	".DS L"			+
+</eq>		+	".DE"			+
+
+<fr>			
+</fr>		
+
+<nu>			"{"
+</nu>			"} over "
+
+<de>			"{"
+</de>			"}"
+
+<lim>			
+</lim>
+
+<op>
+</op>
+
+<ll>			" from {"
+</ll>			"}"
+
+<ul>			" to {"
+</ul>			"}"
+
+<opd>
+</opd>
+
+<pr>			" prod "
+</pr>
+
+<in>			" int "
+</in>
+
+<sum>			" sum "
+</sum>		
+
+% limitation: eqn only does square roots!
+
+<root>			" sqrt {"
+</root>			"}"
+
+<ar>		+	".TS\n"
+			"center, tab(|) ;\n"
+			"[ca]."			+
+</ar>		+	".TE"			+
+
+<arr>   		"\n"			
+</arr>
+
+<arc>   		"|"
+</arc>
+
+
+<sup>			" sup {"
+</sup>			"}"
+
+<inf>			" sub {"
+</inf>			"}"
+
+
+<unl>			"{"
+</unl>			"} under "
+
+<ovl>			"{"
+</ovl>			"} bar "
+
+<rf>			" bold{"
+</rf>			"}"
+
+<v>			"{"
+</v>			"} vec "
+
+% limitation: no calligraphic characters, using helvetica italics instead.  Is there a better font?
+
+<fi>			"\\fI"	
+</fi>			"\\fP"	
+
+<phr>			" roman }"
+</phr>			"}"
+
+
+<tu>		+	".br"		+
+</tu>
+
+% figures
+
+<figure>	% +	".KF"			+
+</figure>	% +	".KE"			+
+
+<eps>		+  	".if t .PSPIC [file].ps\n"
+			".if n .sp 4"	  	+
+</eps>                	
+            	
+% Are TeX units properly handled by this translation of ph?
+
+<ph>		+	".sp [VSPACE]"		+
+</ph>	
+
+<caption>	+	".sp\n.ce"		+
+</caption>
+
+% tables
+
+<table>		+	".KF\n.R"		+
+</table>	+	".KE"			+
+
+<tabular>	+	".TS\n"
+			"center, tab(|) ; \n"
+			"[ca]."			+
+</tabular>	+	".TE"			+
+
+<rowsep>		"\n"			+
+</rowsep>
+
+<colsep>		"|"
+</colsep>
+
+%<hline>		+	"_"			+
+% gregh
+<hline>		+	".hl\n"			+
+
+</hline>
+
+<slides>	+ 	".nr PS 18"		+
+</slides>
+
+<slide>	
+</slide>	+	".bp\n\\&"			+
+
+% letters -- replacement for email, using mh format.
+
+<letter>	+	".nf"	+
+</letter>	+
+
+<from>		+ 	"From: "
+<to>		+	"To: "
+
+<address>	+	".de Ad\n"
+</address>	+	".."	+
+
+<email>			" <"
+</email>		">"
+
+<subject>	+	"Subject: "
+
+<sref>		+	"Sref: "
+<rref>		+	"In-Reply-To: "
+
+<cc>		+	"cc: "
+
+<opening>	+	".fi\n.LP"	+
+
+<closing>	+	".LP"		+
+
+<encl>		+	".XP\n"
+			"encl: "
+
+<ps>		+	".LP\np.s."
+
+
+% end of roff replacement file
diff --git a/doc/sgml2txt b/doc/sgml2txt
new file mode 100755
index 00000000..3f7b6826
--- /dev/null
+++ b/doc/sgml2txt
@@ -0,0 +1,44 @@
+#!/usr/bin/perl 
+#
+#   sgmltools.in
+#
+#   $Id$
+#
+#   SGML-Tools driver. Calls all other SGML-Tools components, contains
+#   configuration information, etcetera.
+#
+package main;
+
+sub BEGIN 
+{
+  require 5.004;
+}
+use strict;
+
+use vars qw($prefix $LibDir $BinDir $progs);
+
+$prefix = "/usr";
+$LibDir = "sbase";
+$BinDir = "/usr/bin";
+
+use lib "/usr/lib/sgml-tools";
+use lib "/usr/perl5";
+use lib "/usr/lib/perl5";
+$progs = {
+  "NSGMLS" => "/usr/bin/nsgmls",
+  "SGMLSASP" => "/usr/bin/sgmlsasp",
+  "GROFF" => "/usr/bin/groff",
+  "GROFFMACRO" => "-mgs"
+};
+
+require SGMLTools;
+&SGMLTools::init;
+
+my @FileList = SGMLTools::process_options ($0, @ARGV);
+for my $curfile (@FileList)
+  {
+    SGMLTools::process_file ($curfile);
+  }
+
+exit 0;
+