The reason is druntime doesn't build separate libs like phobos does.
A quick and dirty patch would be: diff --git a/posix.mak b/posix.mak index 5fd7fee..9ed2004 100644 --- a/posix.mak +++ b/posix.mak@@ -32,9 +32,9 @@ UDFLAGS=-m$(MODEL) -O -release -nofloat -w -d -Isrc -Iimport -property
CFLAGS=-m$(MODEL) -O -OBJDIR=obj +OBJDIR=obj/$(MODEL) DRUNTIME_BASE=druntime -DRUNTIME=lib/lib$(DRUNTIME_BASE).a +DRUNTIME=lib/$(MODEL)/lib$(DRUNTIME_BASE).a DOCFMT=
