[MacPorts] #56971: kerberos5 @1.16.1: configure: error: cannot find output from flex; giving up (was: Failed to configure kerberos5)

[MacPorts]

#56971: kerberos5 @1.16.1: configure: error: cannot find output from flex; giving
up
-------------------------+------------------------
  Reporter:  sealinglip  |      Owner:  ryandesign
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.5.3
Resolution:              |   Keywords:
      Port:  kerberos5   |
-------------------------+------------------------
Changes (by ryandesign):

 * version:  2.5.2 => 2.5.3


Comment:

 The error in the log is:

 {{{
 configure: error: cannot find output from flex; giving up
 }}}

 We have some prior reports of this error with other ports, including
 #55200, where the cause was never found, and #55152, where the user
 reported that they had Homebrew installed and uninstalling Homebrew solved
 the problem.

 Do you have Homebrew installed? If so, try uninstalling it.

 Do you have the MacPorts m4 port installed? The log shows /usr/bin/flex
 was used; this suggests to me that you do not have the MacPorts flex port
 installed, otherwise it would have been used. Try installing the flex port
 with `sudo port install flex`.

-- 
Ticket URL: <https://trac.macports.org/ticket/56971#comment:2>
MacPorts <https://www.macports.org/>
Ports system for macOS