Return a package called OLD-NAME and marked as superseded by P, a package object.

Compile PACKAGE into a bag for SYSTEM, possibly cross-compiled to TARGET, and return it.

Look up NAME among PACKAGE's direct inputs. Return it if found, #f otherwise.

Look up NAME among PACKAGE's inputs. Return it if found, #f otherwise.

Return as a monadic value the absolute file name of FILE within the OUTPUT directory of PACKAGE. When FILE is omitted, return the name of the OUTPUT directory of PACKAGE. When TARGET is true, use it as a cross-compilation target triplet.

Note that this procedure does _not_ build PACKAGE. Thus, the result might or might not designate an existing file. We recommend not using this procedure unless you know what you are doing.

Return the derivation corresponding to ORIGIN.

Cross-build PACKAGE for TARGET (a GNU triplet) from host SYSTEM (a Guix system identifying string).

Return a "hidden" version of P--i.e., one that 'fold-packages' and thus, user interfaces, ignores.

Return the upstream name of PACKAGE, accounting for commonly-used package name prefixes in addition to the upstream-name property.

Return all the direct inputs of PACKAGE---i.e, its direct inputs along with their propagated inputs.