%/ in pattern rule doesn't match './'

[gk]

I am using 'find -type d' to get a list of directories, which the 'find' 
command precedes with './'
I know I could work around my problem by replacing '.' with $(CURDIR) but I 
do not understand why the following pattern rule is not invoked

--- Makefile 1 - BROKEN

-include ./SOURCES.mk

%/SOURCES.mk :
        @echo making $@

--- Makefile 2 - WORKS

-include ./SOURCES.mk

./SOURCES.mk :
        @echo making $@

- Greg Keraunen