--- AnyEvent/Makefile.PL	2010/10/28 04:56:39	1.30
+++ AnyEvent/Makefile.PL	2010/11/22 06:32:18	1.31
@@ -22,7 +22,7 @@
 EOF
 
 do "constants.pl.PL"
-   or die "cannot execute constants.pl.PL";
+   or die "cannot execute constants.pl.PL: $@";
 
 WriteMakefile(
     dist	=> {