MAP_VARIABLE is defined in <sys/mman.h> and in "program.h"
Imported from http://bugzilla.roxen.com/bugzilla/show_bug.cgi?id=13
Reported by @grubba
/i/scratch/autobuild/pike7.1-20000814232049.tar/src/modules/Pipe/../../program.h:514:
warning: `MAP_VARIABLE' redefined
/usr/include/sys/mman.h:80: warning: this is the location of the previous
definition