diff --git a/GNUmakefile b/GNUmakefile
new file mode 100644
index 0000000..9397944
--- /dev/null
+++ b/GNUmakefile
@@ -0,0 +1,28 @@
+SRC = exp.asm file.asm linker.asm out.asm pass1.asm pass2.asm \
+	seg.asm symbol.asm util.asm
+
+OBJECTS = $(SRC:%.asm=obj/%.A) $(SRC:%.asm=obj/%.ROOT)
+
+
+# link order is important.
+linker: $(OBJECTS)
+	iix link \
+	obj/linker obj/util obj/file obj/pass1 obj/pass2 obj/seg \
+	obj/symbol obj/exp obj/out \
+	keep=$@
+	iix chtyp -a 0xdb01 $@
+
+.PHONY: clean
+clean:
+	$(RM) obj/*.A obj/*.ROOT obj/*.a obj.*.root
+	$(RM) linker
+
+
+# fix the filetype on these headers
+# since they have no extension.
+ftype:
+	iix chtyp -l asm directpage
+
+obj/%.A : %.asm %.mac directpage
+	iix compile $< keep=obj/$*
+
diff --git a/build.ninja b/build.ninja
new file mode 100644
index 0000000..4903f9b
--- /dev/null
+++ b/build.ninja
@@ -0,0 +1,50 @@
+# ninja build file.
+
+builddir = obj
+o = obj
+
+
+rule compile
+  command = iix compile $in keep=$o/$keep
+  description = build $out
+
+rule link
+  command = iix link $orca-in keep=$out
+  description = link $out
+
+
+
+
+build linker : link $o/exp.a $o/exp.root $o/file.a $o/file.root $
+  $o/linker.a $o/linker.root $o/out.a $o/out.root $o/pass1.a $o/pass1.root $
+  $o/pass2.a $o/pass2.root $o/seg.a $o/seg.root $o/symbol.a $o/symbol.root $
+  $o/util.a $o/util.root
+  orca-in = $o/linker $o/util $o/file $o/pass1 $o/pass2 $o/seg $
+  $o/symbol $o/exp $o/out
+
+
+build $o/exp.a $o/exp.root : compile exp.asm | exp.mac directpage
+  keep = exp
+build $o/file.a $o/file.root : compile file.asm | file.mac directpage
+  keep = file
+build $o/linker.a $o/linker.root : compile linker.asm | linker.mac directpage
+  keep = linker
+build $o/out.a $o/out.root : compile out.asm | out.mac directpage
+  keep = out
+build $o/pass1.a $o/pass1.root : compile pass1.asm | pass1.mac directpage
+  keep = pass1
+build $o/pass2.a $o/pass2.root : compile pass2.asm | pass2.mac directpage
+  keep = pass2
+build $o/seg.a $o/seg.root : compile seg.asm | seg.mac directpage
+  keep = seg
+build $o/symbol.a $o/symbol.root : compile symbol.asm | symbol.mac directpage
+  keep = symbol
+build $o/util.a $o/util.root : compile util.asm | util.mac directpage
+  keep = util
+
+
+default linker
+
+build all : phony linker
+
+# eof