libgeda FTBFS on Hurd

libgeda FTBFS on Hurd with the following error:

 f_basic.c:662:31: error: 'MAXPATHLEN' undeclared (first use in this function)
 f_basic.c:662:31: note: each undeclared identifier is reported only once for each function it appears in

I was talking now with Debian's GNU/Hurd porters, and they had the following comments on the code:
* fix it to not rely on static buffers for file paths
* while PATH_MAX is POSIX, although optional (and Hurd does not provide it on purpose), MAXPAtHLEN is nowhere standard
* hardcoding MAX_LINK_LEVEL is wrong too, since there is a proper way (using sysconf) to get the maximum level of symlinks before returning ELOOP
* follow_symlinks function looks like a realpath() reimplementation, and if that function could not be just a realpath replacement, it seems g_file_read_link would eventually fail also on ENAMETOOLONG, so the own MAXPATHLEN check could go