Build Failure on ports-10.6_x86_64_legacy

[buildbot at macports.org]

Status:       Failure
Build slave:  ports-10.6_x86_64_legacy
Full logs:    https://build.macports.org/builders/ports-10.6_x86_64_legacy-watcher/builds/11759
Build reason: The SingleBranchScheduler scheduler named 'ports' triggered this build
Port list:    octave-interval
Subport list:
	- octave-interval
Variants:     None
Revision:     c15142fccc719f8208d2d49bae3a73bb4a5ba1fe
Build time:   0:08:33
Author:       Marius Schamschula <mps at macports.org>

Log from failed builds:

Links to individual build jobs:
- ports-10.6_x86_64_legacy-builder #53680
  https://build.macports.org/builders/ports-10.6_x86_64_legacy-builder/builds/53680

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