Linking with Xcode!

Hi
I'm very frustrated with Xcode here. I came from windows and try to do some development for mac and i have to say documentation is hopeless.
I'm just wasting my time figuring out the simplest things.
e.g my codebase needs pnglib - I could build pnglib it, but I can't get my app to use it.
I have it installed in usr/local..
Under Visual studio in windows i find it quite straight forward how to add librarys and paths.
Under Xcode I can't even figure out how to add a simple lib to link with my executable. Where are is this done???
Also where can I edit the final command line arguments for the compiler?
So basically I - as a long software developer for windows (also qnx, but just command line tools) - have bloody no chance to get the simplest thing done with macOs Xcode. (I don't wanna go back to windows, but i'm very tired wasting time here, without getting anything done effectivly)
Also has somebody around here any idea how to get frameworks and more improtantly NIB files to work with cmake tool???
I'm thankfull for any help! Must be very simple anyway? just wanna tell my project to link with a lib in /usr/local ... ???
cheers

thanks, i'll try that!!!
i build libpng myself sucessfully but could get that linked in any app i tried to use it (there i was able to 'drag' the lib into my frameworks), but always had an eror with some platform traget thing that didn't match. (so it didn;t consider this in the linkinf and then ended up with all png stuff un unresolved symbols)
anyway so i used a prebuild of pnglib wich i found, this installs by default in usr/.. which is ok for now, as i just want the bloody thing to link, so i can develop further.
When i get so far that i want to give this to somebody else. Would want to put the lib in the dmg package (which I also haven't figured out how to do that, who to include there, when i press build, and then also link to it .... so if u want to tell me, i will listen ... !!!, then i might also try that !!!)
thank you
cheers

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