Build Failure on ports-10.6_i386: R, gcc8

[buildbot at macports.org]

Status:       Failure
Build slave:  ports-10.6_i386
Full logs:    https://build.macports.org/builders/ports-10.6_i386-watcher/builds/10668
Build reason: The SingleBranchScheduler scheduler named 'ports' triggered this build
Port list:    R
Subport list:
	- R
Variants:     None
Revision:     71899c63ad7c5953b9313aeca35bd7aa44c019c9
Build time:   0:02:25
Author:       Zhenfu Shi <szf1234 at me.com>

Log from failed builds:
	Building 'R' ... [ERROR] (failed to install dependency 'gcc8')
	> maintainers: kjell.konis at me.com,szf1234 at me.com.

Broken ports:
	- R
	- gcc8

Responsible maintainers:
	- kjell.konis at me.com
	- szf1234 at me.com

Links to individual build jobs:
- ports-10.6_i386-builder #18401
  https://build.macports.org/builders/ports-10.6_i386-builder/builds/18401

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