Add additional setup steps

openocd/README.md

@@ -39,6 +39,25 @@ make
 make install
 ```
 
+### Additional Setup
+
+You'll almost certainly end up needing a handful of other helpful tools. Depending on your other
+work you may already have many of these on your machine.
+
+*This command assumes Linux*
+
+```
+sudo apt install autoconf build-essential cmake libtool libtool-bin libhidapi-dev libusb-dev libusb-1.0-0-dev pkg-config
+```
+
+Another essential one is [`gdb`](https://www.gnu.org/software/gdb/) (if you want to do any
+debugging). Most documents on the web say to install `gdb-arm-none-eabi`, but unless you're using an
+older version of `gdb` these days you're going to want `gdb-multiarch`.
+
+```
+sudo apt install gdb-multiarch
+```
+
 ## Basic Use
 
 ### Config files