* Centralize directory creation during do-install in INSTALLATION_DIRS.
* Don't install *.orig files.
* Fix PLIST problems if using xemacs instead of emacs.
Bump PKGREVISION to 4 for PLIST changes.
1) Simplify the way how an emacs version is picked when no emacs
is installed, but a user try to install an Emacs Lisp package.
Just pick up the version set as EMACS_TYPE than searching for
versions already installed etc. If the EMACS_TYPE version is
not supported by the Emacs Lisp Package, just fail. EMACS_TYPE
be default to GNU Emacs 21.
(In other words, users should set EMACS_TYPE as they want.
Otherwise GNU Emacs 21 is used.)
2) All Emacs Lisp Packages *must* prepend EMACS_PKGNAME_PREFIX to
a) the PKGNAME itself, and b) PKGNAME in its dependency lines.
EMACS_PKGNAME_PREFIX is expanded to "xemacs-" when XEmacs is
used. This keeps dependency graph of Emacs-Lisp-packages-
installed-for-XEmacs consistent.
3) Document EMACS_* variables as much as possible.
4) Provide more cookies for PLIST. Maybe utilized later.
Note that the 2) change doesn't affect the default, GNU Emacs 21
behaviour. So no version / revision bumps in this commit.
PR 18497.
From http://www.twelf.org, heavily edited:
Twelf is a research project concerned with the design,
implementation, and application of logical frameworks. It
provides a uniform meta-language for specifying, implementing, and
proving properties of programming languages and logics.
Example suites include Cartesian Closed Categories and
lambda-calculus, the Church-Rosser theorem for the untyped
lambda-calculus, Mini-ML including type preservation and
compilation, cut elimination, theory of logic programming, and
Hilbert's deduction theorem.
The principal authors of Twelf are Frank Pfenning and Carsten
Schuermann, with major contrubtions by Brigitte Pientka, Roberto
Virga, and Kevin Watkins.
