snags getting started with pkgsrc crosscompiling

["John D. Baker" <jdbaker%consolidated.net@localhost>]

So, I'm taking my first steps in the brave new world that is cross-
building pkgsrc.  My target is sparc.  Following the example (cut-paste-
edit) in "HOWTO-use-crosscompile", I added the following to my global
"/etc/mk.conf":

# mk.conf

.ifdef BSD_PKG_MK

[ my usual stuff...]

###########################################################################
#
# Cross-compile for sparc
#
##########################################################################
USE_CROSS_COMPILE?=  yes

# Point pkgsrc at the NetBSD tooldir and destdir for cross builds.
TOOLDIR=             /r0/build/netbsd-10/tools/amd64
CROSS_DESTDIR=       /r0/build/netbsd-10/DEST/sparc

# Specify the machine architecture of target packages.
CROSS_MACHINE_ARCH=  sparc

# Specify the OS of target packages.
CROSS_OPSYS=         NetBSD
CROSS_OS_VERSION=    10.0
CROSS_OPSYS_VERSION= 100000
CROSS_LOWER_OPSYS=   netbsd
CROSS_LOWER_OPSYS_VERSUFFIX= # empty
CROSS_LOWER_OS_VARIANT=      # empty
CROSS_LOWER_VARIANT_VERSION= # empty
CROSS_LOWER_VENDOR=          # empty
CROSS_OBJECT_FMT=    ELF

LOCALBASE=	/r0/build/netbsd-10/xpkg/${CROSS_MACHINE_ARCH}

.endif


Unfortunately, something's not quite right as the attempt to install
"cross-libtool-base" fails with the following:

[...]
===> Building binary package for cross-libtool-base-NetBSD-10.0-sparc-2.4.7nb8
=> Creating binary package /r0/build/netbsd-10/packages/sparc/All/cross-libtool-base-NetBSD-10.0-sparc-2.4.7nb8.tgz
=> Becoming ``root'' to make su-real-package-install (sudo)
===> Installing binary package of cross-libtool-base-NetBSD-10.0--2.4.7nb8
pkg_add: Can't process file:///tmp/pkgsrc/cross/cross-libtool-base/work.NetBSD-10.0-/.packages/cross-libtool-base-NetBSD-10*: No such file or directory
pkg_add: no pkg found for '/tmp/pkgsrc/cross/cross-libtool-base/work.NetBSD-10.0-/.packages/cross-libtool-base-NetBSD-10.0--2.4.7nb8.tgz', sorry.
pkg_add: 1 package addition failed
*** Error code 1

Stop.
make: stopped in /x/pkgsrc/cross/cross-libtool-base
*** Error code 1

Stop.
make[2]: stopped in /x/pkgsrc/cross/cross-libtool-base
*** Error code 1

Stop.
make[1]: stopped in /x/pkgsrc/cross/cross-libtool-base
*** Error code 1

Stop.


The CROSS_MACHINE_ARCH value is somehow missing from one of the path
elements and from the name of the package build under the $WRKOBJDIR
when passed to 'pkg_add'.

Please advise.

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