Feature Manipulation - Guile Reference Manual

To check whether a particular feature is available, use the provided? procedure:

— Scheme Procedure: provided? feature
— Deprecated Scheme Procedure: feature? feature

Return #t if the specified feature is available, otherwise #f.

To advertise a feature from your own Scheme code, you can use the provide procedure:

— Scheme Procedure: provide feature

Add feature to the list of available features in this Guile process.

For C code, the equivalent function takes its feature name as a char * argument for convenience:

— C Function: void scm_add_feature (const char *str)

Add a symbol with name str to the list of available features in this Guile process.