whole dep file, not only in the first line.
(s=`cd $s; /bin/pwd`; \
$(patsubst %/,cd %;,$(objpfx)) \
sed -n 's/^stub_warning *(\([^)]*\).*$$/#define __stub_\1/p' \
- `sed -n -e '\@: $s@{; s@^.*: $s/\([a-z0-9_./-]*\.c\).*$$@'"$$s"'/\1@; h; }' \
+ `sed -n -e '\@ $s/[^ ]*\.c@{; s@^.* $s/\([^ ]*\.c\).*$$@'"$$s"'/\1@; h; }' \
-e '/stub-tag\.h/{; g; p; }' \
$(patsubst $(objpfx)%,%,$^) /dev/null` \
/dev/null) > $@T