[2.6.0-beta1 & LibcxxOnOlderSystems] stack fails to build

[Bjarne D Mathiesen]

Command failed:  export
PATH=/usr/bin:/macports/bin:/macports/sbin:/bin:/sbin:/usr/bin:/usr/sbin
 PREFIX=/macports  CC=/usr/bin/gcc ;
/macports/var/macports/build/_macports_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_stack/stack/work/stack-2.1.3-osx-x86_64/bin/stack
setup  --stack-root
/macports/var/macports/build/_macports_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_stack/stack/work/.stack
--with-gcc /usr/bin/gcc  --allow-different-user  &&
/macports/var/macports/build/_macports_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_stack/stack/work/stack-2.1.3-osx-x86_64/bin/stack
build  --stack-root
/macports/var/macports/build/_macports_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_stack/stack/work/.stack
--with-gcc /usr/bin/gcc  --allow-different-user

I've also tried "port -t install stack +bootstrap"

is "--with-gcc /usr/bin/gcc" the problem ?!?
and how do I solve it ?!? : port install libgcc ?!?

-- 
Bjarne D Mathiesen
Korsør ; Danmark ; Europa
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denne besked er skrevet i et (næsten) M$-frit miljø
MacOS X 10.13.6 High Sierra :
   17" 2011 MacBook Pro ; 2.8GHz Intel Core i7 ; 16GB 1067MHz DDR3
   2012 Mac Pro ; 2 x 3.46GHz 6-Core Xeon ; 48GB
MacOS X 10.6.8 Snow Leopard :
   Mac Mini ; 2GHz Core 2 Duo (64 bit) ; 4GB (3GB actual) 667MHz
   Mac Mini ; 1.83GHz Core Duo (32 bit) ; 2GB 667Mhz