make install fails with "Authenticating extension failed: Kext com.coresystems.DirectHW v1.6.1"

[aveach]

Trying to install @joevt's fork and when I try to make install DirectHW I get this failure:

sudo kextunload -v /Library/Extensions/DirectHW.kext || :
Executing: /usr/bin/kmutil unload -p /Library/Extensions/DirectHW.kext
Error Domain=KMErrorDomain Code=3 "Error occurred unloading extensions: Missing extension with identifier com.coresystems.DirectHW : Authenticating extension failed: Kext com.coresystems.DirectHW v1.6.1 in executable kext bundle com.coresystems.DirectHW at /private/var/db/KernelExtensionManagement/Staging/com.coresystems.DirectHW.USttIj/DirectHW.kext:

Authenticating extension failed: Bad code signature" UserInfo={NSLocalizedDescription=Error occurred unloading extensions: Missing extension with identifier com.coresystems.DirectHW : Authenticating extension failed: Kext com.coresystems.DirectHW v1.6.1 in executable kext bundle com.coresystems.DirectHW at /private/var/db/KernelExtensionManagement/Staging/com.coresystems.DirectHW.USttIj/DirectHW.kext:

Authenticating extension failed: Bad code signature}
sudo kextload -v /Library/Extensions/DirectHW.kext
Executing: /usr/bin/kmutil load -p /Library/Extensions/DirectHW.kext
Error Domain=KMErrorDomain Code=29 "Authenticating extension failed: Kext com.coresystems.DirectHW v1.6.1 in executable kext bundle com.coresystems.DirectHW at /private/var/db/KernelExtensionManagement/Staging/com.coresystems.DirectHW.f9aSuH/DirectHW.kext:

Authenticating extension failed: Bad code signature" UserInfo={NSLocalizedDescription=Authenticating extension failed: Kext com.coresystems.DirectHW v1.6.1 in executable kext bundle com.coresystems.DirectHW at /private/var/db/KernelExtensionManagement/Staging/com.coresystems.DirectHW.f9aSuH/DirectHW.kext:

Authenticating extension failed: Bad code signature}
make: *** [install] Error 29

Mac info:

[joevt]

Code signing is not something I've looked into. I usually have SIP disabled so it doesn't matter.