diff --git a/make.texinfo b/make.texinfo
index 4cbea08e..fa8d66e8 100644
--- a/make.texinfo
+++ b/make.texinfo
@@ -9,7 +9,7 @@
@set EDITION 0.43
@set VERSION 3.68 Beta
-@set UPDATED 21 June 1993
+@set UPDATED 25 June 1993
@set UPDATE-MONTH June 1993
@c finalout
@@ -96,7 +96,7 @@ Cover art by Etienne Suvasa.
@page
@ifinfo
-@node Top, Copying, (dir), (dir)
+@node Top, Overview, (dir), (dir)
@top Make
The GNU @code{make} utility automatically determines which pieces of a
@@ -111,7 +111,6 @@ This manual describes @code{make} and contains the following chapters:@refill
@end ifinfo
@menu
-* Copying::
* Overview:: Overview of @code{make}.
* Introduction:: An introduction to @code{make}.
* Makefiles:: Makefiles tell @code{make} what to do.
@@ -317,10 +316,7 @@ Implicit Rule for Archive Member Targets
* Archive Symbols:: How to update archive symbol directories.
@end menu
-@node Copying, Overview, Top, Top
-@include gpl.texinfo
-
-@node Overview, Introduction, Copying, Top
+@node Overview, Introduction, Top, Top
@comment node-name, next, previous, up
@chapter Overview of @code{make}
@@ -6102,6 +6098,14 @@ running a @code{touch} command on the given file before running
@code{make}, except that the modification time is changed only in the
imagination of @code{make}.
@xref{Instead of Execution, ,Instead of Executing the Commands}.
+
+@item --warn-undefined-variables
+@cindex @code{--warn-undefined-variables}
+@cindex variables, warning for undefined
+@cindex undefined variables, warning message
+Issue a warning message whenever @code{make} sees a reference to an
+undefined variable. This can be helpful when you are trying to debug
+makefiles which use variables in complex ways.
@end table
@node Implicit Rules, Archives, Running, Top
@@ -6250,22 +6254,23 @@ available unless the makefile explicitly overrides or cancels them.
canceling or overriding an implicit rule. The @samp{-r} or
@samp{--no-builtin-rules} option cancels all predefined rules.
-Not all of these rules will always be defined, even when the @samp{-r} option
-is not given. Many of the predefined implicit rules are implemented in
-@code{make} as suffix rules, so which ones will be defined depends on the
-@dfn{suffix list} (the list of dependencies of the special target
-@code{.SUFFIXES}). The default suffix list is: @code{.out}, @code{.a},
-@code{.ln}, @code{.o}, @code{.c}, @code{.cc}, @code{.C}, @code{.p},
-@code{.f}, @code{.F}, @code{.r}, @code{.y}, @code{.l}, @code{.s}, @code{.S},
-@code{.mod}, @code{.sym}, @code{.def}, @code{.h}, @code{.info}, @code{.dvi},
-@code{.tex}, @code{.texinfo}, @code{.texi}, @code{.txinfo}, @code{.w},
-@code{.web}, @code{.sh}, @code{.elc}, @code{.el}. All of the implicit rules
-described below whose dependencies have one of these suffixes are actually
-suffix rules. If you modify the suffix list, the only predefined suffix
-rules in effect will be those named by one or two of the suffixes that are on
-the list you specify; rules whose suffixes fail to be on the list are
-disabled. @xref{Suffix Rules, ,Old-Fashioned Suffix Rules}, for full details
-on suffix rules.
+Not all of these rules will always be defined, even when the @samp{-r}
+option is not given. Many of the predefined implicit rules are
+implemented in @code{make} as suffix rules, so which ones will be
+defined depends on the @dfn{suffix list} (the list of dependencies of
+the special target @code{.SUFFIXES}). The default suffix list is:
+@code{.out}, @code{.a}, @code{.ln}, @code{.o}, @code{.c}, @code{.cc},
+@code{.C}, @code{.p}, @code{.f}, @code{.F}, @code{.r}, @code{.y},
+@code{.l}, @code{.s}, @code{.S}, @code{.mod}, @code{.sym}, @code{.def},
+@code{.h}, @code{.info}, @code{.dvi}, @code{.tex}, @code{.texinfo},
+@code{.texi}, @code{.txinfo}, @code{.w}, @code{.ch} @code{.web},
+@code{.sh}, @code{.elc}, @code{.el}. All of the implicit rules
+described below whose dependencies have one of these suffixes are
+actually suffix rules. If you modify the suffix list, the only
+predefined suffix rules in effect will be those named by one or two of
+the suffixes that are on the list you specify; rules whose suffixes fail
+to be on the list are disabled. @xref{Suffix Rules, ,Old-Fashioned
+Suffix Rules}, for full details on suffix rules.
@table @asis
@item Compiling C programs
@@ -6454,12 +6459,14 @@ The same command is used on the C code produced from
@pindex .tex
@pindex .web
@pindex .w
-@file{@var{n}.dvi} is made from @file{@var{n}.tex} with the
-command @samp{$(TEX)}. @file{@var{n}.tex} is made from
-@file{@var{n}.web} with @samp{$(WEAVE)}, or from @file{@var{n}.w}
-with @samp{$(CWEAVE)}. @file{@var{n}.p} is made from
-@file{@var{n}.web} with @samp{$(TANGLE)} and @file{@var{n}.c} is
-made from @file{@var{n}.w} with @samp{$(CTANGLE)}.@refill
+@pindex .ch
+@file{@var{n}.dvi} is made from @file{@var{n}.tex} with the command
+@samp{$(TEX)}. @file{@var{n}.tex} is made from @file{@var{n}.web} with
+@samp{$(WEAVE)}, or from @file{@var{n}.w} (and from @file{@var{n}.ch} if
+it exists or can be made) with @samp{$(CWEAVE)}. @file{@var{n}.p} is
+made from @file{@var{n}.web} with @samp{$(TANGLE)} and @file{@var{n}.c}
+is made from @file{@var{n}.w} (and from @file{@var{n}.ch} if it exists
+or can be made) with @samp{$(CTANGLE)}.@refill
@item Texinfo and Info
@cindex Texinfo, rule to format