echo "Checking $$f..."; \
asf_file_dir=`dirname $$f`; \
xsltproc XDK/lufa_filelist_transform.xslt $$f | sed -e "/^$$/d" | while read -r i; do \
- if ( ! test -f "$$asf_file_dir/$$i" ); then \
+ if ( ( ! test -f "$$asf_file_dir/$$i" ) && ( ! test -d "$$asf_file_dir/$$i" ) ); then \
echo "Source file \"$$i\" referenced in $$f does not exist!"; \
exit 1; \
fi; \