* Backport: Documentation/topdocs/INSTALL.texi: Update GCC, Flex and

* Backport: Documentation/topdocs/INSTALL.texi: Update GCC, Flex and
  GUILE info. Add info about CVS.

* autogen.sh: Generate.

* stepmake/configure:
* configure: Regenerate.

* Backport: stepmake/stepmake/automatically-generated.sub.make: Keep
  original first line.

* Backport: stepmake/stepmake/toplevel-targets.make (autogen.sh): Add rule.

* Backport: stepmake/stepmake/generic-targets.make (configure): Generate
  using autogen.sh.

* Backport: GNUmakefile.in (SCRIPTS):
* Backport: stepmake/GNUmakefile.in (SCRIPTS): Add autogen.sh

* Backport: stepmake/autogen.sh: New file.

* Backport: configure: Check for g++ >= 2.95.

* Backport: stepmake/aclocal.m4: Fixes for FlexLexer.h, Python headers.  GNU
  c/c++ version checking.

* Backport: Documentation/windows/GNUmakefile: Avoid collapsed directory
  constructs '//'.

* Backport: stepmake/bin/install-dot-exe.sh: Filter collapsed directory
  constructs '//' from arguments.