[csw-maintainers] how to avoid "Unknown option: --exec_prefix=/opt/csw"

[rupert THURNER]

how can one avoid the error "Unknown option: --exec_prefix=/opt/csw" with mgar?
:

rupert @ unstable9s : ~/mgar-sav/pkg/cmake/trunk
$ mgar clean platforms
...
==> Running configure in work/solaris9-sparc/build-isa-sparcv8/cmake-2.8.8
cd work/solaris9-sparc/build-isa-sparcv8/cmake-2.8.8 && mkdir -p . &&
cd . && /usr/bin/env -i
PATH="/home/rupert/mgar-sav/pkg/.buildsys/v2/gar/bin/sos12-wrappers:/home/rupert/mgar-sav/pkg/cmake/trunk/work/solaris9-sparc/install-isa-sparcv8/opt/csw/bin:/home/rupert/mgar-sav/pkg/cmake/trunk/work/solaris9-sparc/install-isa-sparcv8/opt/csw/bin:/home/rupert/mgar-sav/pkg/cmake/trunk/work/solaris9-sparc/install-isa-sparcv8/opt/csw/sbin:/home/rupert/mgar-sav/pkg/cmake/trunk/work/solaris9-sparc/install-isa-sparcv8/opt/csw/sbin:/opt/csw/bin:/opt/csw/bin:/opt/csw/sbin:/opt/csw/sbin:/opt/SUNWspro/bin:/home/rupert/mgar-sav/pkg/.buildsys/v2/gar/bin:/usr/bin:/usr/sbin:/usr/java/bin:/usr/ccs/bin:/usr/openwin/bin"
prefix="/opt/csw" exec_prefix="/opt/csw" bindir="/opt/csw/bin"
sbindir="/opt/csw/sbin" libexecdir="/opt/csw/libexec"
datadir="/share/cmake-2.8.8" sysconfdir="/etc/opt/csw"
sharedstatedir="/share" localstatedir="/var/opt/csw"
libdir="/opt/csw/lib" infodir="/share/info"
lispdir="/share/emacs/site-lisp" includedir="/opt/csw/include"
mandir="/share/man" docdir="/share/doc/cmake-2.8.8"
sourcedir="/opt/csw/src" CPPFLAGS="-I/opt/csw/include" CFLAGS="-xO3
-m32 -xarch=v8 -xnorunpath" CXXFLAGS="-xO3 -m32 -xarch=v8 -norunpath"
LDFLAGS="-m32 -xarch=v8 -L/opt/csw/lib" FFLAGS="-xO3 -m32 -xarch=v8"
FCFLAGS="-xO3 -m32 -xarch=v8" ASFLAGS="" OPTFLAGS="-xO3 -m32
-xarch=v8" CC="/opt/SUNWspro/bin/cc" CXX="/opt/SUNWspro/bin/CC"
CC_HOME="/opt/SUNWspro" CC_VERSION="Sun C 5.9 SunOS_sparc Patch
124867-16 2010/08/11" CXX_VERSION="Sun C++ 5.9 SunOS_sparc Patch
124863-28 2011/12/14" GARCH="sparc" GAROSREL="5.9" GARPACKAGE="trunk"
LD_OPTIONS="-R/opt/csw/lib" PKG_CONFIG_PATH="/opt/csw/lib/pkgconfig"
DESTDIR="/home/rupert/mgar-sav/pkg/cmake/trunk/work/solaris9-sparc/install-isa-sparcv8"
 /home/rupert/mgar-sav/pkg/cmake/trunk/work/solaris9-sparc/build-isa-sparcv8/cmake-2.8.8/configure
--prefix=/opt/csw --exec_prefix=/opt/csw --bindir=/opt/csw/bin
--sbindir=/opt/csw/sbin --libexecdir=/opt/csw/libexec
--datadir=/share/cmake-2.8.8 --sysconfdir=/etc/opt/csw
--sharedstatedir=/share --localstatedir=/var/opt/csw
--libdir=/opt/csw/lib --infodir=/share/info
--includedir=/opt/csw/include --mandir=/share/man
--docdir=/share/doc/cmake-2.8.8
/home/rupert/mgar-sav/pkg/cmake/trunk/work/solaris9-sparc/build-isa-sparcv8/cmake-2.8.8/bootstrap:
bad substitution
Unknown option: --exec_prefix=/opt/csw
gmake[2]: *** [configure-work/solaris9-sparc/build-isa-sparcv8/cmake-2.8.8/configure]
Error 1
gmake[2]: Leaving directory `/home/rupert/mgar-sav/pkg/cmake/trunk'
gmake[1]: *** [merge-isa-sparcv8] Error 2
gmake[1]: Leaving directory `/home/rupert/mgar-sav/pkg/cmake/trunk'
gmake: *** [platforms] Error 2