Windows doesn't understand single quotes, so it fudges the command.

security/coreconf/jniregen.pl

@@ -99,8 +99,9 @@ foreach $filename (@ARGV)
 
 if( @filelist ) {
     $cmd = "$javah " . join(" ",@filelist);
+    $cmd =~ s/\'/\"/g;  # because windows doesn't understand single quote
     print "$cmd\n";
-    system("$cmd");
+    exit (system($cmd) >> 8);
 } else {
     print "All JNI header files up to date.\n"
 }