[smartmontools-support] problem with scterc on a mac

[Dennis Couzin]

Subject: problem with scterc on a mac

I want to adjust the error recovery time limit on a drive.  
I'm running mac OSX Sierra (10.12.6).  MacPorts installed smartctl:
	smartctl 7.0 2018-12-30 r4883 [Darwin 16.7.0 x86_64] (local build)
In another system, Macbrew installed smartctl:
	smartctl 7.1 2019-12-30 r5022 [Darwin 16.7.0 x86_64] (local build)

With both installs, smartctl says I can do it.
	cmartctl --identify disk6
answers:
	206      3          1   SCT Error Recovery Control supported

But when I try:
	smartctl -l scterc disk6
the result is always:
	SMART WRITE LOG does not return COUNT and LBA_LOW register
	SCT (Get) Error Recovery Control command failed

Same problem for other disks.

So, does the command
	-l scterc 
not work in the Darwin version of smartctl?   
Why not?

Thanks for all help.
DC