--with-widgets=motif --with-dialogs=motif --with-scrollbars=motif
--with-xft=no causes a compilation failure, at least with openmotif 2.3.3.

This happens because motif also defines USE_XFT and --with-xft=no does
not define HAVE_XFT in the source code, and then assumes that USE_XFT
won't be defined either. This leads to:

x86_64-pc-linux-gnu-gcc -c -Wall -Wno-switch -Wundef -Wsign-compare
-Wno-char-subscripts -Wpacked -Wshadow -Wmissing-declarations
-Wmissing-prototypes -Wstrict-prototypes -Wdeclaration-after-statement 
-Wunused-parameter -g -O3 -fno-strict-aliasing -Wall -O2 -pipe
-march=native  -Demacs -I.
-I/var/tmp/portage/app-editors/xemacs-21.5.31/work/xemacs-21.5.31/src
-DHAVE_CONFIG_H -I/usr/X11R6/include redisplay-x.c
In file included from redisplay-x.c:33:
redisplay-xlike-inc.c: In function ‘separate_textual_runs_xft_mule’:
redisplay-xlike-inc.c:270: error: ‘XftChar16’ undeclared (first use in
this function)
redisplay-xlike-inc.c:270: error: (Each undeclared identifier is
reported only once
redisplay-xlike-inc.c:270: error: for each function it appears in.)
redisplay-xlike-inc.c:270: error: expected expression before ‘)’ token


I've applied the following fix in Gentoo:

	# Motif also defines USE_XFT so compiling with "motif -xft" fails,
	# since -xft turns off xft using HAVE_XFT and Motif enables only the
	# USE_XFT part.
	sed -i -e 's/USE_XFT/XEMACS_USE_XFT/' src/*xlike-inc* || die