--- groff-1.20.1-r1.ebuild	2009-03-12 20:20:40.000000000 +0000
+++ groff-1.20.1-r1.ebuild.new	2009-03-12 20:20:16.000000000 +0000
@@ -24,6 +24,22 @@
 		x11-libs/libICE
 	)"
 
+pkg_setup()
+{
+	# The host groff version needs to be the same then what we try to emerge.
+	if tc-is-cross-compiler ; then
+		HOSTGROFF=$(groff -v | grep 'GNU groff version' | sed -e 's/GNU groff version //')
+		if [ "${HOSTGROFF}" == "" ]; then
+			die "Groff must be installed on host for cross-compiling!"
+		fi
+		if [ "${HOSTGROFF}" != "${PV}" ]; then
+			eerror "Groff version ${HOSTGROFF} is installed on your host,"
+			eerror "but version ${PV} is required for cross-compilation."
+			die "Can't crosscompile groff due to version mismatch."
+		fi
+	fi
+}
+
 src_unpack() {
 	unpack ${A}
 	cd "${S}"