In order to compile the source code you will need to keep the folder hierarchy of the headers: on your root folder(where you are planning to compile your externals) you must keep the info.plist and maxmspsdk.xcconfig files.
create a root folder and copy the c74support contained on the sdk. Create another folder inside of the root which will contain your code. Copy the two files mentioned above inside this folder. It is better to copy a template project from the sdk and then replacing the c file for your code.
Hope this helps!