gcl-doc 2.6.12-126 (amd64 binary) in ubuntu lunar

 GNU Common Lisp (GCL) is a Common Lisp compiler and interpreter
 implemented in C, and complying mostly with the standard set
 forth in the book "Common Lisp, the Language I". It attempts
 to strike a useful middle ground in performance and portability
 from its design around C.
 .
 This package contains Documentation in info format of both the
 system internals, as well as the graphical interface currently
 implemented in Tcl/Tk.