+nit__nith.types.4.o: nit__nith.types.4.c
+ $(CC) $(CFLAGS) $(CINCL) -c -o nit__nith.types.4.o nit__nith.types.4.c
+
+nit__nith.types.5.o: nit__nith.types.5.c
+ $(CC) $(CFLAGS) $(CINCL) -c -o nit__nith.types.5.o nit__nith.types.5.c
+
+nit__nith.types.6.o: nit__nith.types.6.c
+ $(CC) $(CFLAGS) $(CINCL) -c -o nit__nith.types.6.o nit__nith.types.6.c
+
+# does pkg-config exists?
+ifneq ($(shell which pkg-config >/dev/null; echo $$?), 0)
+$(error "Command `pkg-config` not found. Please install it")
+endif
+# Check for library bdw-gc
+ifneq ($(shell pkg-config --exists 'bdw-gc'; echo $$?), 0)
+$(error "pkg-config: package bdw-gc is not found.")
+endif