update build instructions

README.md

@@ -6,8 +6,9 @@ a command line utility to bulk download media from jellyfin servers (e.g., shows
 ## Building
 
 1. Install [roswell](https://github.com/roswell/roswell)
-2. `$ mkdir ~/common-lisp && git clone https://dev.focks.website/focks/seanut ~/common-lisp/seanut`
+2. `$ ros install sbcl-bin/2.3.9 && ros use sbcl-bin/2.3.9`
-3. `$ cd ~/common-lisp/seanut && make`
+3. `$ mkdir ~/common-lisp && git clone https://dev.focks.website/focks/seanut ~/common-lisp/seanut`
+4. `$ cd ~/common-lisp/seanut && make`
 
 ## Running