pkg/56665: BISON_REQD has no effect

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>Number:         56665
>Category:       pkg
>Synopsis:       BISON_REQD has no effect
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    pkg-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Jan 24 08:45:00 +0000 2022
>Originator:     Niclas Rosenvik
>Release:        pkgsrc-current from 2022 jan 5
>Organization:
>Environment:
NetBSD localhost 9.2 NetBSD 9.2 (CAN_KERNEL) #0: Mon Dec 13 17:36:42 CET 2021  niclas@localhost:/usr/src/sys/arch/amd64/compile/CAN_KERNEL amd64
>Description:
When creating a package that uses bison as a tool with USE_TOOLS+=bison
and BISON_REQD=3.0 pkgsrc outputs the line:
=> Tool dependency bison>=1.0: found bison-3.8.2

When setting GMAKE_REQD=3.0 for gmake the output is
=> Tool dependency gmake>=3.0: found gmake-4.3

This is as it should be.
BISON_REQD can even be set to 4.0 a version newer than the one released and used in pkgsrc and the the build just continues with the same output line as above. My conclusion is that BISON_REQD has no effect and that something is wrong in pkgsrc/mk/tools/bison.mk .
>How-To-Repeat:
Do the steps in the full description.
>Fix: