From mboxrd@z Thu Jan  1 00:00:00 1970
From: Alan Jenkins <alan-jenkins@tuffmail.co.uk>
Date: Tue, 21 Oct 2008 10:10:17 +0000
Subject: git build error: missing "udev-rules2"
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To: linux-hotplug@vger.kernel.org

make[3]: *** No rule to make target `udev-rules2.o', needed by
`test-udev'.  Stop.
make[3]: Leaving directory `/home/alan/Documents/bootup/src/udev/udev'
make[2]: *** [all-recursive] Error 1
make[2]: Leaving directory `/home/alan/Documents/bootup/src/udev/udev'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/home/alan/Documents/bootup/src/udev'
make: *** [all] Error 2

------------------------------- udev/Makefile.am
-------------------------------
index c374942..faf68d6 100644
@@ -17,7 +17,7 @@ common_files = \
     udev-sysdeps.h \
     udev-event.c \
     udev-node.c \
-    udev-rules.c \
+    udev-rules2.c \
     udev-util.c \
     lib/libudev.h \
     lib/libudev-private.h \

Maybe you renamed the file and forget to tell git?