Warning: -Wimplicit-function-declaration

[Bjarne D Mathiesen]

MacPorts 2.7.0
I've just done my usual :
port -dN selfupdate
port outdated
port clean --all outdated
port -upN upgrade outdated
port -pN clean --work installed

& I got this :

--->  Configuring snort
Warning: Configuration logfiles contain indications of
-Wimplicit-function-declaration; check that features were not
accidentally disabled:
  pcap_lex_destroy: found in snort-2.9.17.1/config.log
--->  Building snort


--->  Configuring wget
Warning: Configuration logfiles contain indications of
-Wimplicit-function-declaration; check that features were not
accidentally disabled:
  MIN: found in wget-1.21.1/config.log
  strchr: found in wget-1.21.1/config.log
--->  Building wget

I've never seen this before !?!
Is it something I have to worry about ?!?
And if so : how do I fix it ?!?

-- 
Bjarne D Mathiesen
Korsør ; Danmark ; Europa
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denne besked er skrevet i et totalt M$-frit miljø
OpenCore + macOS 10.15.7 Catalina
MacPro 2010 ; 2 x 3,46 GHz 6-Core Intel Xeon ; 256 GB 1333 MHz DDR3 ECC
ATI Radeon RX 590 8 GB