It is used by at least crunchide(1).
# cross-build on a FreeBSD 10 host:
_elftctools+= usr.bin/addr2line
.endif
+.elif ${TARGET_ARCH} != ${MACHINE_ARCH} && ${MK_ELFTOOLCHAIN_TOOLS} != "no"
+# If cross-building with an external binutils we still need to build strip for
+# the target (for at least crunchide).
+_elftctools= lib/libelftc \
+ usr.bin/elfcopy
.endif
# If an full path to an external cross compiler is given, don't build