buildsystem: export SED variable

Author: uyjulian

scripts/006-gcc-stage2.sh

@@ -51,6 +51,7 @@ if [ "$(uname -s)" = "Darwin" ]; then
     alias sed='gsed'
     TARG_XTRA_OPTS="--with-system-zlib --with-libiconv_prefix=$MACPORT_BASE --with-gmp=$MACPORT_BASE --with-mpfr=$MACPORT_BASE --with-mpc=$MACPORT_BASE"
   fi
+  export SED=$(which gsed)
 fi
 
 ## Determine the maximum number of processes that Make can work with.