Build Failure on ports-10.6_x86_64: lilypond-devel

[buildbot at macports.org]

Status:       Failure
Build slave:  ports-10.6_x86_64
Full logs:    https://build.macports.org/builders/ports-10.6_x86_64-watcher/builds/695
Build reason: The SingleBranchScheduler scheduler named 'ports' triggered this build
Port list:    lilypond-devel
Subport list:
	- lilypond-devel
Variants:     None
Revision:     a252834637d9db1a1251eecb09154c21f438629f
Build time:   1:28:42
Author:       Eric Benson <ebseattle at gmail.com>

Log from failed builds:
	Building 'lilypond-devel' ... [ERROR] (failed to fetch dependency 'gcc9')
	> maintainers: snc at macports.org.

Broken ports:
	- lilypond-devel

Responsible maintainers:
	- snc at macports.org

Links to individual build jobs:
- ports-10.6_x86_64-builder #4761
  https://build.macports.org/builders/ports-10.6_x86_64-builder/builds/4761

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MacPorts Buildbot
https://build.macports.org/