CHICKEN version dependent expansion

[Christian Himpe]

Dear All,

I am trying to define a function depending on the version of CHICKEN.  I was 
thinking to use "cond-expand" for this purpose, but found no suitable feature 
in the documentation ( 
http://wiki.call-cc.org/man/5/Extensions%20to%20the%20standard#cond-expand ) 
that could achieve this, only if a CHICKEN is currently expanding. R7RS 
suggests such features (in Appendix B: <name-version>) and other Schemes such 
as Guile ( 
https://www.gnu.org/software/guile/manual/html_node/SRFI_002d0.html#index-cond_002dexpand
 ) and Gauche ( 
https://practical-scheme.net/gauche/man/gauche-refe/Feature-conditional.html#index-cond_002dexpand
 ) provide such features. Did I miss something in the documentation, or is 
there an alternative ("R5RS") way to do this?

Thank You

Christian