Not a NetBSD user, but the ERROR message(s) names the way to fix it:
Code:
ERROR: This package has set PKG_FAIL_REASON:
ERROR: pkgsrc has been configured to use a system provided X11 installation
ERROR: but one could not be found. Possible solutions:
ERROR:
ERROR: *) install X headers and libraries in X11BASE (currently /usr/X11R7)
ERROR: *) set X11_TYPE=modular in mk.conf to use X11 from pkgsrc
ERROR: