 dc4e43682c
			
		
	
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			Just `depend_on('ncurses')`, pkgconfig seems to cause the right thing
to happen if the package is built +termlib or ~termlib (tested both
ways on a CentOS 7 system).
Additional details in: https://github.com/spack/spack/issues/15281
Tested by building all of the releases of tmux on a CentOS 7 box.