limodou/ido — pull request #4 by wolfg1969 (2014-06-23 04:24:23+00:00)
Title: use relative path for PREFIX

I tried to install zlib with following command:
```
$ cd /opt
$ ido install zlib -p ./install
```
I found it was installed in /tmp/ido_packages_build/zlib-1.2.8/install instead of /opt/install. So I made this change to allow using relative path for PREFIX.