--- a/lib/Test/Nginx.pm
+++ b/lib/Test/Nginx.pm
@@ -18,9 +18,12 @@ our @EXPORT = qw/ log_in log_out http /;
 use File::Temp qw/ tempdir /;
 use IO::Socket;
 use Socket qw/ CRLF /;
+use Test::More qw//;
 
 ###############################################################################
 
+our $NGINX = '../nginx/objs/nginx';
+
 sub new {
 	my $self = {};
 	bless $self;
@@ -40,6 +43,13 @@ sub DESTROY {
 	$self->stop();
 }
 
+sub has {
+	my ($self, $feature, %options) = @_;
+	Test::More::plan(skip_all => "$feature not compiled in")
+		unless `$NGINX -V 2>&1` =~ $feature;
+	Test::More::plan($options{plan}) if defined $options{plan};
+}
+
 sub run {
 	my ($self, $conf) = @_;
 
@@ -54,7 +64,7 @@ sub run {
 	die "Unable to fork(): $!\n" unless defined $pid;
 
 	if ($pid == 0) {
-		exec('../nginx/objs/nginx', '-c', "$testdir/nginx.conf", '-g',
+		exec($NGINX, '-c', "$testdir/nginx.conf", '-g',
 			"pid $testdir/nginx.pid; "
 			. "error_log $testdir/error.log debug;")
 			or die "Unable to exec(): $!\n";

--- a/smtp-greeting-delay.t
+++ b/smtp-greeting-delay.t
@@ -7,7 +7,7 @@
 use warnings;
 use strict;
 
-use Test::More tests => 2;
+use Test::More;
 
 use MIME::Base64;
 use Socket qw/ CRLF /;
@@ -23,7 +23,8 @@ use Test::Nginx::SMTP;
 select STDERR; $| = 1;
 select STDOUT; $| = 1;
 
-my $t = Test::Nginx->new()->write_file_expand('nginx.conf', <<'EOF')->run();
+my $t = Test::Nginx->new()->has('mail', plan => 2)
+	->write_file_expand('nginx.conf', <<'EOF')->run();
 
 master_process off;
 daemon         off;

--- a/smtp.t
+++ b/smtp.t
@@ -9,7 +9,7 @@
 use warnings;
 use strict;
 
-use Test::More tests => 26;
+use Test::More;
 
 use MIME::Base64;
 use Socket qw/ CRLF /;
@@ -26,6 +26,7 @@ select STDERR; $| = 1;
 select STDOUT; $| = 1;
 
 my $t = Test::Nginx->new()
+	->has('mail', plan => 26)
 	->run_daemon(\&Test::Nginx::SMTP::smtp_test_daemon)
 	->write_file_expand('nginx.conf', <<'EOF')->run();