Document a race condition issue

Author: khorben

src/project.conf

@@ -19,6 +19,8 @@ cflags=-W -Wall -O2 -pedantic -D_FORTIFY_SOURCE=2 -fstack-protector
 [cpp]
 type=binary
 sources=main.c
+#XXX should really use this (race condition with "make -k")
+depends=$(OBJDIR)lib/libcpp$(SOEXT)
 depends=$(OBJDIR)lib/libcpp.a
 ldflags=-L$(OBJDIR)lib -L$(LIBDIR) -Wl,-rpath,$(LIBDIR) -lcpp
 install=$(BINDIR)