===>  Building for rxvt-2.7.10
cc -DHAVE_CONFIG_H   -O2 -pipe -DDEBUG_STRICT  -I/usr/X11R6/include -I.. -I. -I. -c rxvt.c
In file included from rxvt.c:1:
rxvtlib.h:46:73: X11/Intrinsic.h: No such file or directory
In file included from rxvt.c:1:
rxvtlib.h:114: error: syntax error before "Window"
rxvtlib.h:250: error: syntax error before "Window"
rxvtlib.h:262: error: syntax error before "Window"
rxvtlib.h:279: error: syntax error before "Display"
rxvtlib.h:281: error: syntax error before "XSizeHints"
rxvtlib.h:285: error: syntax error before "Cursor"
*** Error code 1

Stop in /usr/ports/x11/rxvt/w-rxvt-2.7.10/rxvt-2.7.10/src.
*** Error code 1

Stop in /usr/ports/x11/rxvt/w-rxvt-2.7.10/rxvt-2.7.10 (line 102 of Makefile).
*** Error code 1

Stop in /usr/ports/x11/rxvt (line 2063 of /usr/ports/infrastructure/mk/bsd.port.mk).