x11-libs/neXtaw: fix configure w/ clang 16

Closes: https://bugs.gentoo.org/879779
Signed-off-by: Sam James <sam@gentoo.org>

x11-libs/neXtaw/neXtaw-0.15.1-r5.ebuild

@@ -1,9 +1,9 @@
-# Copyright 1999-2022 Gentoo Authors
+# Copyright 1999-2023 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=8
 
-inherit flag-o-matic
+inherit autotools flag-o-matic
 
 DESCRIPTION="Athena Widgets with N*XTSTEP appearance"
 HOMEPAGE="https://siag.nu/neXtaw/"
@@ -33,6 +33,13 @@ PATCHES=(
 	"${FILESDIR}"/${P}-clang16.patch
 )
 
+src_prepare() {
+	default
+
+	# Clang 16, bug #879779
+	eautoreconf
+}
+
 src_configure() {
 	append-cflags -std=gnu89 # old codebase, incompatible with c2x
 	append-cflags -fno-strict-aliasing #864535