Index: cddl/lib/libzpool/Makefile
===================================================================
--- cddl/lib/libzpool/Makefile
+++ cddl/lib/libzpool/Makefile
@@ -239,6 +239,7 @@
 	-I${SRCTOP}/sys/modules/zfs \
 	-I${ZFSTOP}/include/os/freebsd/zfs \
 	-DLIB_ZPOOL_BUILD -DZFS_DEBUG \
+	-DHAVE_LARGE_STACKS=1
 
 # XXX: pthread doesn't have mutex_owned() equivalent, so we need to look
 #      into libthr private structures. That's sooo evil, but it's only for
Index: sys/modules/zfs/Makefile
===================================================================
--- sys/modules/zfs/Makefile
+++ sys/modules/zfs/Makefile
@@ -39,6 +39,10 @@
 CFLAGS+= -DBITS_PER_LONG=64
 .endif
 
+.if ${MACHINE_CPUARCH} != "mips" && ${MACHINE_ARCH} != "arm"
+CFLAGS+= -DHAVE_LARGE_STACKS=1
+.endif
+
 SRCS=	vnode_if.h device_if.h bus_if.h
 
 # avl