Thanks for the review. I applied most of the changes and poushed as
03e80cf42240f65346713ff414eb2ca628ef0884

If did not apply

> Suggestion: replace (getenv "C_INCLUDE_PATH") with
> (getenv ,(if (%current-target-system)
>              "CROSS_C_INCLUDE_PATH"
>              "C_INCLUDE_PATH")).
> Likewise for LIBRARY_PATH.
since "CROSS_C" is used on 14 times in gnu/packages/*.scm and not at all
in guix/build*. So I assume this is not the way to implement
cross-compiling :-)

-- 
Regards
Hartmut Goebel

| Hartmut Goebel          | h.goebel@crazy-compilers.com               |
| www.crazy-compilers.com | compilers which you thought are impossible |