--- /usr/bin/mysqldumpslow	2008-01-17 16:43:11.000000000 +0100
+++ mysqldumpslow	2008-01-17 16:49:08.000000000 +0100
@@ -34,13 +34,14 @@
 $opt{'help'} and usage();
 
 unless (@ARGV) {
-    my $defaults   = `my_print_defaults mysqld`;
+    my $defaults   = `my_print_defaults mysqld -c /etc/mysql/my.cnf`;
     my $basedir = ($defaults =~ m/--basedir=(.*)/)[0]
-	or die "Can't determine basedir from 'my_print_defaults mysqld' output: $defaults";
+	or die "Can't determine basedir from 'my_print_defaults mysqld' -c /etc/mysql/my.cnf output: $defaults";
     warn "basedir=$basedir\n" if $opt{v};
 
     my $datadir = ($defaults =~ m/--datadir=(.*)/)[0];
-    my $slowlog = ($defaults =~ m/--log-slow-queries=(.*)/)[0];
+    my $slowlog = ($defaults =~ m/--log[-_]slow[-_]queries=(.*)/)[0];
+
     if (!$datadir or $opt{i}) {
 	# determine the datadir from the instances section of /etc/my.cnf, if any
 	my $instances  = `my_print_defaults instances`;