--- /usr/portage/dev-libs/libmodbus/libmodbus-2.9.3.ebuild	2011-04-13 22:01:07.000000000 +0200
+++ libmodbus-3.0.1.ebuild	2011-09-29 11:28:24.540685376 +0200
@@ -15,6 +15,7 @@
 
 src_prepare() {
 	sed -i '/CFLAGS/s:-Werror::' configure || die #363477
+	sed -i 's:doc/modbus.7:doc/libmodbus.7:' configure || die #upstream issue #28
 }
 
 src_configure() {