chocolatedoom arch compile issue

./docgen -m manpage.template ../src > chocolate-doom.6
  File "./docgen", line 392
    print line.rstrip()
             ^
SyntaxError: invalid syntax
make[2]: *** [chocolate-doom.6] Error 1
make[2]: Leaving directory `/home/arin/Downloads/chocolate-doom/src/chocolate-doom-1.4.0/man'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/home/arin/Downloads/chocolate-doom/src/chocolate-doom-1.4.0'
make: *** [all] Error 2