Index: share/man/man4/Makefile
===================================================================
--- share/man/man4/Makefile
+++ share/man/man4/Makefile
@@ -867,9 +867,12 @@
 _nvme.4=	nvme.4
 .endif
 
-.if exists(${.CURDIR}/man4.${MACHINE_CPUARCH})
-SUBDIR=	man4.${MACHINE_CPUARCH}
+MAN_ARCH?=	${MACHINE_CPUARCH}
+.for __arch in ${MAN_ARCH}
+.if exists(${.CURDIR}/man4.${__arch})
+SUBDIR+=	man4.${__arch}
 .endif
+.endfor
 
 .if ${MK_BLUETOOTH} != "no"
 MAN+=		ng_bluetooth.4
Index: share/man/man5/make.conf.5
===================================================================
--- share/man/man5/make.conf.5
+++ share/man/man5/make.conf.5
@@ -24,7 +24,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd February 23, 2017
+.Dd July 9, 2018
 .Dt MAKE.CONF 5
 .Os
 .Sh NAME
@@ -399,6 +399,11 @@
 .Xr malloc 3 .
 It also defaults the A and J runtime options to off.
 Disabled by default on -CURRENT.
+.It Va MAN_ARCH
+.Pq Vt str
+Space-delimited list of one or more ARCH and/or CPUARCH values
+for which section 4 man pages will be installed.
+The default is the MACHINE_CPUARCH being built.
 .It Va MODULES_WITH_WORLD
 .Pq Vt bool
 Set to build modules with the system instead of the kernel.