--- AnyEvent/Makefile.PL	2015/07/16 12:48:38	1.43
+++ AnyEvent/Makefile.PL	2017/02/04 03:49:36	1.44
@@ -22,7 +22,7 @@
 
 EOF
 
-do "constants.pl.PL"
+do "./constants.pl.PL"
    or die "cannot execute constants.pl.PL: $@";
 
 WriteMakefile(