The LispWorks Editor's C Mode offers a convenient alternative to using foreign-parser:process-foreign-file directly as above. It also allows you to generate and load a C object file.
To use this, you should be familiar with the LispWorks Editor as described in the LispWorks IDE User Guide and the LispWorks Editor User Guide .
LispWorks Foreign Language Interface User Guide and Reference Manual - 7 Dec 2011