Improve dependency graph.

Makefile

@@ -23,8 +23,17 @@
 # CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 #
 
+.PHONY: default
+default: imports
+
+.PHONY: shared
+shared: brmsaptool
+
+.PHONY: static
+static: brmsaptool-static
+
 .PHONY: all
-all: brmsaptool
+all: imports shared static
 
 CSC=csc
 
@@ -50,6 +59,9 @@ BRMSAPTOOL-SHARED=testing.so listing.so month.so period.so ansi.so	\
 		members-base.so utils.so primes.so member-record.so	\
 		configuration.so progress.so
 
+.PHONY: imports
+imports: $(BRMSAPTOOL-DEPS)
+
 brmsaptool: $(BRMSAPTOOL-DEPS)
 	$(CSC) -o $@ $<