Index: head/sys/modules/pwm/Makefile
===================================================================
--- head/sys/modules/pwm/Makefile	(revision 366380)
+++ head/sys/modules/pwm/Makefile	(revision 366381)
@@ -1,13 +1,15 @@
 # $FreeBSD$
 
 # Modules for dev/pwm drivers.
 
 SUBDIR = \
 	pwmbus \
 	pwmc \
 
+.if ${MACHINE_ARCH} == "armv7" || ${MACHINE_ARCH} == "aarch64"
 .if !empty(OPT_FDT)
 SUBDIR += pwm_backlight
+.endif
 .endif
 
 .include <bsd.subdir.mk>