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/23661
Build reason: The SingleBranchScheduler scheduler named 'ports' triggered this build
Port list:    octave-signal
Subport list:
	- octave-signal
Variants:     None
Revision:     af2cbbb220e3c774ce35fd9e9c82882eedd29f52
Build time:   0:26:53
Author:       Marius Schamschula <mps at macports.org>

Log from failed builds:

Links to individual build jobs:
- ports-10.6_x86_64_legacy-builder #99646
  https://build.macports.org/builders/ports-10.6_x86_64_legacy-builder/builds/99646

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