m4: needs wchar support in toolchain

Reported-by: Marcus Osdoba <marcus.osdoba@googlemail.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

CHANGES

@@ -19,8 +19,8 @@
 	ifplugd, iptables, jpeg, kexec, kismet, less, libcurl,
 	libdnet, libevent, libglade, libgtk2, libiconv, libidn, libnl,
 	liboil, libpcap, libpng, libungif, libxml2, libxslt, lighttpd,
-	lite, mdadm, metacity, mysql_client, nano, nbd, ncftp, neon,
-	netperf, ntfsprogs, openntpd, openssh, openvpn, oprofile,
+	lite, m4, mdadm, metacity, mysql_client, nano, nbd, ncftp,
+	neon, netperf, ntfsprogs, openntpd, openssh, openvpn, oprofile,
 	pango, pcre, php, prboom, radvd, qt, samba, sdl_sound,
 	shared-mime-info, speex, sqlite, strace, taglib, tcpdump,
 	tiff, tn5250, udpcast, usbutils, which, xlib_libX11

package/m4/Config.in

@@ -1,6 +1,10 @@
 config BR2_PACKAGE_M4
 	bool "m4"
+	depends on BR2_USE_WCHAR
 	help
 	  An implementation of the traditional Unix macro processor.
 
 	  http://www.gnu.org/software/m4/m4.html
+
+comment "m4 requires a toolchain with WCHAR support"
+	depends on !BR2_USE_WCHAR