--- collectd-5.0.2/configure.in.old	2012-03-20 18:44:53.000000000 +0100
+++ collectd-5.0.2/configure.in	2012-03-20 18:45:54.000000000 +0100
@@ -2128,7 +2128,7 @@
 if test "x$with_libmodbus" = "xuse_pkgconfig"
 then
 	AC_MSG_NOTICE([Checking for modbus using $PKG_CONFIG])
-	$PKG_CONFIG --exists 'modbus' 2>/dev/null
+	$PKG_CONFIG --exists 'libmodbus' 2>/dev/null
 	if test $? -ne 0
 	then
 		with_libmodbus="no (pkg-config doesn't know modbus)"
@@ -2136,12 +2136,12 @@
 fi
 if test "x$with_libmodbus" = "xuse_pkgconfig"
 then
-	with_libmodbus_cflags="`$PKG_CONFIG --cflags 'modbus'`"
+	with_libmodbus_cflags="`$PKG_CONFIG --cflags 'libmodbus'`"
 	if test $? -ne 0
 	then
 		with_libmodbus="no ($PKG_CONFIG failed)"
 	fi
-	with_libmodbus_libs="`$PKG_CONFIG --libs 'modbus'`"
+	with_libmodbus_libs="`$PKG_CONFIG --libs 'libmodbus'`"
 	if test $? -ne 0
 	then
 		with_libmodbus="no ($PKG_CONFIG failed)"