Undefined symbol "__ncov_block"

[R. T. (Fortran Man)]

I am trying to use the coverage tool, but I am getting a link error that says it can't find something called "ncov_block". How do I fix this?

[Lahey Support]

This error message is generated when the -cover option is specified on the compile command but not the link command. It must be on both commands.

There was an LF95 bug in which the automake.fig file incorrectly used
-cover only on the command line. This has been fixed. If you are encountering this problem when using Automake, download the latest patch for your version of the compiler.