It is probably best to use the GNU Emacs package manager to install the latest REDUCE IDE package; Installation of REDUCE IDE. None of the manual installation described below is then required. But if you want to install by hand, or understand the details of the installation process, then read on.
REDUCE Run mode requires the library reduce-mode both when it is compiled and when it is loaded. It tries quite hard to locate this library, but normally it should be in the same directory as reduce-run.
Byte-compile the file reduce-run.el, put the result somewhere in
your load-path, and put the following in your .emacs file:
(autoload 'run-reduce "reduce-run" "Run a REDUCE process" t)
To control access to the features of REDUCE Run mode from REDUCE mode
you can customize the option reduce-run-autoload. See REDUCE Run mode customization.
You can customize the values of the options
reduce-root-dir-file-name and reduce-run-commands
(see Running, rerunning and switching to
REDUCE) if the default values are not correct, and/or to add commands
to run additional versions of REDUCE, such as those built directly
from the Subversion repository or REDUCE on Common Lisp.
The option reduce-run-commands has been changed so that a
REDUCE command is a list of strings rather than a single string, which
allows spaces in both the command and its arguments. Run mode
automatically updates a saved value to the new structure and offers to
edit and/or save it. There is now a facility to set the environment
variable reduce.
The option reduce-run-installation-directory has been renamed
to reduce-root-dir-file-name and become a directory file name
rather than a directory name, i.e. the final directory separator has
been removed. This makes it suitable as the default value of the
environment variable reduce.
The option reduce-run-MSWin-drives has been removed and its use
incorporated into the definition of reduce-root-dir-file-name,
without using any external programs.
The shorthand $reduce has been introduced to be replaced at the
start of strings (other than Name) in reduce-run-commands and
reduce-packages-directory with the value of
reduce-root-dir-file-name before they are used.
The special support for PSL REDUCE has been removed since it is not
needed when REDUCE is run directly and is no longer needed from REDUCE
revision 6726 when REDUCE is run using a batch file. If you had
customized reduce-run-commands then you may need to
erase the customization (at least for PSL REDUCE) and then
re-customize it.