Assign proper value to var

builder_scripts/builder_common.sh

@@ -3782,6 +3782,7 @@ install_pkg_install_ports_build() {
                                 echo "Done!"
                         fi
                         install_pkg_install_ports_build $EXTRAPORT
+                        _BUILT_PKGNAME="`make -C $EXTRAPORT -V PKGNAME`"
 			echo -n ">>> Building port $_PORTNAME($_BUILT_PKGNAME) as runtime dependency of ($PORTNAME)...Done!"
                 done