[PATCH] gnu: Add fontconfig-path-max.

[rennes]

Hello Guix team,

i'm doing tests whith GNU Guix on GNU Hurd, compiling fontconfig and 
there is an error during compilation:

a) fontconfig uses the constant PATH_MAX.

Reviewing the documentation about the treatment of constant for Hurd; 
i've attached a patch for review.

References:
https://www.gnu.org/software/hurd/community/gsoc/project_ideas/maxpath.html
https://www.gnu.org/software/hurd/hurd/porting/guidelines.html

and i've a couple of questions about:

a) How Guix identify if it is a Linux or Hurd system at compile or 
install the package?.
b) i searches in ML an example, but i not found.



Thanks for your time.

Rene

0001-gnu-Add-fontconfig-path-max.patch
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