I have a MAC OS 10.7.5. I just downloaded the latest version of bowtie2: bowtie2-2.2.4 and wanted to install it. After I unzipped the file I wrote command "make", but it says "make: *** No targets specified and no makefile found. Stop." Then I entered ./configure and the answer was -bash: ./configure: No such file or directory. I've searched about it from many forums but still couldn't find any solution. What is the problem? How should I solve it?