Follow-up Comment #10, bug #23876 (project gnustep):
The macro definition is in config/procfs.m4. I don't know where it came
from, but definitely not Autoconf.
The test being performed there is going to fail in chroots that do not mount
/proc.
FWIW, it doesn't fail on Debian autobuilders; from a Debian buildd log for
1.16.3:
checking procfs.h usability... no
checking procfs.h presence... no
checking for procfs.h... no
checking kernel support for /proc filesystem... yes
checking support for /proc psinfo struct... no
checking link to exe of process in /proc... /proc/self/exe
checking /proc/10669/cmdline terminated by nul... yes
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