--- mpi.net-1.0.0.orig/MPI/Unsafe.pl	2009-02-03 23:55:48.000000000 +0100
+++ mpi.net-1.0.0/MPI/Unsafe.pl	2009-02-07 08:24:01.000000000 +0100
@@ -96,7 +96,7 @@
 }
 
 # Grab the command-line arguments
-$mpi_header=shift @ARGV;
+$mpi_header = (@ARGV > 3) ? shift @ARGV : "/usr/include/mpi.h";
 $unsafe_input = shift @ARGV;
 $unsafe_output = shift @ARGV;
 $cbridge_output = shift @ARGV;