osx - Failing to build PostGIS on OS X 10.7 Lion

I am trying to install postGIS from source to match the default install of postgreSQL on OS X 10.7. I installed GEOS and PORJ.4 from Kyngchaos and ran

$export MACOSX_DEPLOYMENT_TARGET=10.7
$export CFLAGS="-Os -arch i386 -arch x86_64" 
$export PG_CPPFLAGS="-arch i386 -arch x86_64"
$export SHLIB_LINK="-arch i386 -arch x86_64"
$export LDFLAGS="-arch i386 -arch x86_64"

$cd ~/source/postgis
postgis $./configure --with-pgconfig=/usr/bin/pg_config --with-geosconfig=/Library/Frameworks/GEOS.framework/Versions/3/unix/bin/geos-config --with-projdir=/Library/Frameworks/PROJ.framework/Unix

I get this

PostGIS is now configured for x86_64-apple-darwin11.0.0

however after running make i get the following error

collect2: ld returned 1 exit status
lipo: can't open input file: /var/folders/dh/11gwx5cs5sl8v4r7qrzf3pd00000gn/T//ccsAdaB9.out (No such file or directory)
make[1]: *** [postgis-1.5.so] Error 1

make: *** [postgis] Error 2

Something i don't know about (architecture?) seems wrong here. Any clue? Thanks in advance.