--- /usr/portage/sci-electronics/ngspice/ngspice-31.ebuild	2019-11-03 23:39:39.000000000 +0100
+++ /var/lib/layman/__mine__/sci-electronics/ngspice/ngspice-31.ebuild	2019-11-04 10:17:29.359965556 +0100
@@ -109,7 +109,7 @@
 			--with-ngshared"
 	elif [ "${MULTIBUILD_VARIANT}" == "tcl" ]; then
 		myconf="${myconf} \
-			--with-tcl"
+			--with-tcl=/usr/$(get_libdir)"
 	else
 		myconf="${myconf} \
 			$(use_enable deprecated oldapps) \