The build was failing for two reasons:
1. When devel/readline was installed (e.g. as a dependency of
editors/emacs), its newer interface caused:
readline.c:147:51: error: expected expression
147 | rl_attempted_completion_function = (CPPFunction *) completion_fp;
| ^
readline.c:147:38: error: use of undeclared identifier 'CPPFunction'
147 | rl_attempted_completion_function = (CPPFunction *) completion_fp;
| ^
Patch radius's lib/readline.c to use the modern rl_completion_func_t
type.
2. The elisp files were not being installed, causing a staging error.
Fix this by installing the elisp in a post-install-EMACS-on target.
Sponsored by: The FreeBSD Foundation
Joseph Mingrone
e93f6442ef