Index: objfw-config.in
==================================================================
--- objfw-config.in
+++ objfw-config.in
@@ -54,12 +54,24 @@
 	while test x"$1" != "x"; do
 		case "$1" in
 			*.m)
 				obj="${1%.m}.o"
 				objs="$objs $obj"
+				build="no"
+				deps=$($OBJC -E -M $CPPFLAGS $ENV_CPPFLAGS $1 |\
+				       sed 's/.*: //' | sed 's/\\//g')
+
+				if test -f "$obj"; then
+					for dep in $deps; do
+						test "$dep" -nt $obj && \
+							build="yes"
+					done
+				else
+					build="yes"
+				fi
 
-				if test ! -f "$obj" -o "$1" -nt "$obj"; then
+				if test x"$build" = x"yes"; then
 					link="yes"
 					echo "Compiling $1..."
 					$OBJC $CPPFLAGS $OBJCFLAGS \
 						$ENV_CPPFLAGS $ENV_OBJCFLAGS \
 						-c -o $obj $1 || exit $?