Make sure build root is correct (no override from rpmmacros).

packaging/linux/rpm/buildpackage.sh

@@ -21,7 +21,6 @@ cp openra.spec openra$ARCH.spec
 sed -i "s/{VERSION_FIELD}/$PKGVERSION/" openra$ARCH.spec
 rootdir=`readlink -f $2`
 sed -i "s|{ROOT_DIR}|$rootdir|" openra$ARCH.spec
-sed -i "s/{ARCH}/$ARCH/" openra$ARCH.spec
 
 for x in `find $rootdir -type f`
 do
@@ -33,7 +32,7 @@ cp openra$ARCH.spec "$3/SPECS/"
 
 cd "$3"
 
-rpmbuild --target $ARCH -bb SPECS/openra$ARCH.spec
+rpmbuild --target $ARCH --buildroot /tmp/openra$ARCH/ -bb SPECS/openra$ARCH.spec
 if [ $? -ne 0 ]; then
   exit 1
 fi