Create a global Makefile

src/Makefile

+SUBDIRS := $(wildcard */.)
+
+all: $(SUBDIRS)
+
+$(SUBDIRS):
+	$(MAKE) -C $@
+
+clean:
+	rm -f $(BUILDDIR)/cluster/*.o
+	rm -f $(BUILDDIR)/sphere/*.o
+	rm -f $(BUILDDIR)/trapping/*.o
+
+wipe:
+	rm -f $(BUILDDIR)/cluster/*
+	rm -f $(BUILDDIR)/sphere/*
+	rm -f $(BUILDDIR)/trapping/*
+
+.PHONY: all $(SUBDIRS)