Build Failure on ports-10.14_x86_64

[buildbot at macports.org]

Status:       Failure
Build slave:  ports-10.14_x86_64
Full logs:    https://build.macports.org/builders/ports-10.14_x86_64-watcher/builds/20551
Build reason: The SingleBranchScheduler scheduler named 'ports' triggered this build
Port list:    R-app
Subport list:
	- R-app
Variants:     None
Revision:     8597e5f30cb9c3cc269561f725a4dbe9c5067245
Build time:   1:08:45
Author:       Zhenfu Shi <szf1234 at me.com>

Log from failed builds:

Links to individual build jobs:
- ports-10.14_x86_64-builder #69753
  https://build.macports.org/builders/ports-10.14_x86_64-builder/builds/69753

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