+GBM_FILES = \
+ $(DIRECTORY)/src/gbm/Makefile \
+ $(DIRECTORY)/src/gbm/main/*.pc.in \
+ $(DIRECTORY)/src/gbm/main/*.[ch] \
+ $(DIRECTORY)/src/gbm/main/Makefile \
+ $(DIRECTORY)/src/gbm/backends/Makefile \
+ $(DIRECTORY)/src/gbm/backends/Makefile.template \
+ $(DIRECTORY)/src/gbm/backends/*/*.[ch] \
+ $(DIRECTORY)/src/gbm/backends/*/Makefile \
+