Fix: shell script is hard

Author: till

Makefile

@@ -3,7 +3,7 @@ ifdef TRAVIS_PHP_VERSION
 	composer self-update
 	composer install --prefer-source
 else
-	test -s ./composer.phar || { curl -sS https://getcomposer.org/installer | php }
+	if [ ! -f ./composer.phar ]; then curl -sS https://getcomposer.org/installer | php; fi
 	./composer.phar install --prefer-source
 endif