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S9fES (require-extension <extension> ...) ==> unspecific
When the given <extension>s have been compiled into the interpreter
expanding this form, the form evaluates to an unspecific value. When
at least one of the given <extension>s is absent, an error is
signalled.
Each extension may be either a symbol or a list of the form
(or <name> ...)
where each <name> names an extension. For the REQUIRE-EXTENSIONS form
to succeed, it is sufficient if one of the extensions named in (or ...)
is present. For example:
(require-extension curses)
requires the CURSES extension to be compiled-in, and
(require-extension (or sys-unix sys-plan9))
requires either the SYS-UNIX or the SYS-PLAN9 extension to be present.
(In the unlikely case that both the SYS-UNIX and SYS-PLAN9 extensions
would be detected, the form would still succeed).
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