「It is written in pure Guile, and allows configuration files to be written in scheme (as well as Vixie's original format) for infinite flexibility in specifying when jobs should be run.」GNUプロジェクト mcron
「To encourage customization, Guile provides extensive interfaces, allowing C code to interact with the Scheme world. C code can freely create, access, and mutate Scheme objects; C functions may call Scheme functions and vice versa; C code may add new types to the Scheme world and take advantage of Guile's garbage collection… Most of the standard Scheme procedures are implemented by C functions, visible to Guile clients; for example, applications can call the C function scm_cons, which is the underlying implementation of the Scheme procedures cons.」Blandy、1997年, pp. 94, 96.
