PhAB - Command 'sort' failed

Using QNX 4.25.
Just encountered “Command ‘sort’ failed” during “Generate”.
Generate completes okay without further errors but then Make complains with
the following, “Unexpected end of line seen”.
This is a project that built fine a few weeks ago and has not been modified
Tried compiling the project on another node and no problems.
Seems to be a new problem on the node.

Any ideas?