build maven project without setting compiler source and target

[java-crypto]

So as I just got new into using Netbeans someone on its list explained 
me, that it's just a gui wrapper around maven and it's adviced to get 
the basics of maven to correctly use netbeans.
Ok, so as I just used a simple editor and a terminal it didn't mattered 
wich version I compiled with or for in the past as I ran the class with 
the same vm I compiled them with. So, the I thought I could just ommit 
the setting - but maven just fails with an error that no source/target 
version was specified. So I had them re-add by re-apply the project 
settings.
Is there a way I could tell the compiler plugin just to ignore the 
version but also to ignore if it's missing and just compile it with 
whatever version I ran maven with?
It's basically: I use different systems all with different jdk installed 
- so when just clone the most recent version from github I always have 
to set the correct version manual as netbeans doesn't seem to be handle 
that by itself - and I could find an option to just get rid of it at 
all.

Thanks in advance,
Matt

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