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MADEIRA-PORT Indended to be used mainly as :DEFSYSTEM-DEPENDS-ON dependency in ASDF systems, but can also be useful outside ASDF systems. The provided component class :MADEIRA-PORT makes it easy to specify implementation (or feature) dependent files as part of an ASDF system definition: (:MADEIRA-PORT <name> :WHEN <feature-expression>) Specifies that the file is to be compiled and loaded only when the feature expression evaluates to true under FEATURE-EVAL for the current implementation. (:MADEIRA-PORT <name> :UNLESS <feature-expression>) Specifies that the file is to be compiled and loaded only when the feature expression evaluates to false under FEATURE-EVAL for the current implementation. Example: (defsystem :foo :serial t :defsystem-depends-on (:madeira-port) :components ((:file "package") (:module "ports" :components ((:madeira-port "sbcl" :when :sbcl) (:madeira-port "ccl" :when :ccl) (:madeira-port "ansi" :unless (:or :sbcl :ccl)))) (:file "foo"))) Also provides FEATURE-EVAL mentioned above, which supports extended feature syntax, allowing expression such as (:FIND-FUNCTION #:EXIT :SB-EXT) Finally, exposes FEATURE-EVAL via EXTEND-FEATURE-SYNTAX, which copies the current readtable, adds extended versions of #+ and #- read macros to it, and assigns it to *READTABLE*.