In article <6eea98b205072419253d48a952@mail.gmail.com>,
	Marcelo Avalos <marcelo.netbsd@gmail.com> writes:
> I try to install fluxbox,

From "pkgsrc" or manually?

> checking for XOpenDisplay in lX11... no
> configure: error: Could not find XOpenDisplay in -lX11.
> *** Error code 1
> Stop.

This is not enough information. What NetBSD version are using on what
platform? Are you building manually or from package source? Did you
do a complete NetBSD installation (all distribution sets)? What is
the output of "config.log" for the above check, ...

	Kind regards

-- 
Matthias Scheler                                  http://scheler.de/~matthias/