I can't help but get the feeling I'm being trolled here, but: the C in CLISP actually stands for Common, not the C language.
CLISP is not really written in C proper; but files with *.d suffix are C with heavy pre-processor use that make them look like Pascal. It also uses "var" keyword to declare new variables, along with shell-style # line comments. It also uses German for variables and comments. Things have been changing heavily as of late, and there is more push toward C style and English usage, but here is what it look(s|ed) like.
http://clisp.cvs.sourceforge.net/viewvc/clisp/clisp/src/intc...
The code is beautiful and readable, but very unidiomatic.
Your lack of class is why having a reasonable discussion on this site is impossible.