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As a first step to porting FPS, I want to write Olin Shivers' define-record macro so that it works with guile. In FPS, define-record is written to use an explicit renaming macro system. I decided that implementing the explicit renaming system is a bit too much to take on for one's first scheme program. (Assuming it can be done in scheme.) Instead I intend to rewrite the define-record macro. I can do this using guile's define-macro, but the resulting macro uses will be vulnerable to the bindings of keywords in their environment (won't they?). I can't use the syntax-case macros on their own, because define-record is unhygienic (it defines global constructors, accessors, type-predicates etc.) So my question is, how do I write unhygienic macros in guile that are not prone to having their global references captured? Ian