diff --git a/.hgignore b/.hgignore
index 1105d6c..49d34a0 100644
--- a/.hgignore
+++ b/.hgignore
@@ -1,3 +1,5 @@
 .obj
 .vscode
+__pycache__
+.*\.orig
 
diff --git a/arch/brother/pn8510/build.py b/arch/brother/pn8510/build.py
index 88e532d..8344ae0 100644
--- a/arch/brother/pn8510/build.py
+++ b/arch/brother/pn8510/build.py
@@ -138,17 +138,17 @@
     bootfile=".+bootfile_img",
     map={
         "-readme.txt": ".+readme",
-        #"dump.com": "cpmtools+dump",
-        #"stat.com": "cpmtools+stat",
-        #"asm.com": "cpmtools+asm",
-        #"copy.com": "cpmtools+copy",
-        #"submit.com": "cpmtools+submit",
+        "dump.com": "cpmtools+dump",
+        "stat.com": "cpmtools+stat",
+        "asm.com": "cpmtools+asm",
+        "copy.com": "cpmtools+copy",
+        "submit.com": "cpmtools+submit",
         #"asm80.com": "third_party/dr/asm80",
         #"camel80.com": "third_party/camelforth",
         #"bbcbasic.com": "third_party/bbcbasic+bbcbasic_ADM3A",
-        #"mkfs.com": "cpmtools+mkfs",
-        #"rawdisk.com": "cpmtools+rawdisk",
-        #"qe.com": "cpmtools+qe_BROTHER_POWERNOTE",
+        "mkfs.com": "cpmtools+mkfs",
+        "rawdisk.com": "cpmtools+rawdisk",
+        "qe.com": "cpmtools+qe_BROTHER_POWERNOTE",
         #"z8e.com": "third_party/z8e+z8e_POWERNOTE",
         #"ted.com": "third_party/ted+ted_POWERNOTE",
     },
diff --git a/build/ab.mk b/build/ab.mk
new file mode 100644
index 0000000..024cefa
--- /dev/null
+++ b/build/ab.mk
@@ -0,0 +1,54 @@
+ifeq ($(findstring 4.,$(MAKE_VERSION)),)
+$(error You need GNU Make 4.x for this (if you're on OSX, use gmake).)
+endif
+
+OBJ ?= .obj
+PYTHON ?= python3
+CC ?= gcc
+CXX ?= g++
+AR ?= ar
+CFLAGS ?= -g -Og
+LDFLAGS ?= -g
+PKG_CONFIG ?= pkg-config
+ECHO ?= echo
+TARGETS ?= +all
+
+ifdef VERBOSE
+	hide =
+else
+	ifdef V
+		hide =
+	else
+		hide = @
+	endif
+endif
+
+ifeq ($(OS), Windows_NT)
+	EXT ?= .exe
+endif
+EXT ?=
+
+include $(OBJ)/build.mk
+
+MAKEFLAGS += -r
+.DELETE_ON_ERROR:
+
+.PHONY: update-ab
+update-ab:
+	@echo "Press RETURN to update ab from the repository, or CTRL+C to cancel." \
+		&& read a \
+		&& (curl -L https://github.com/davidgiven/ab/releases/download/dev/distribution.tar.xz | tar xvJf -) \
+		&& echo "Done."
+
+.PHONY: clean
+clean::
+	@echo CLEAN
+	$(hide) rm -rf $(OBJ)
+
+export PYTHONHASHSEED = 1
+build-files = $(shell find . -name 'build.py') $(wildcard build/*.py) $(wildcard config.py)
+$(OBJ)/build.mk: Makefile $(build-files)
+	@echo "AB"
+	@mkdir -p $(OBJ)
+	$(hide) $(PYTHON) -X pycache_prefix=$(OBJ) build/ab.py -o $@ build.py \
+		|| rm -f $@
diff --git a/build/ack.py b/build/ack.py
index cde9484..e133583 100644
--- a/build/ack.py
+++ b/build/ack.py
@@ -1,13 +1,27 @@
-from build.c import cprogram
+from build.ab import emit
+from build.c import cprogram, clibrary
+
+emit(
+    """
+ACKCC ?= ack
+ACKAAL ?= aal
+     """
+)
+
 
 class AckToolchain:
     label = "ACK"
-    cfile = ["$(CC) -c -o {outs[0]} {ins[0]} $(CFLAGS) {cflags}"]
-    cxxfile = ["$(CXX) -c -o {outs[0]} {ins[0]} $(CFLAGS) {cflags}"]
-    clibrary = ["$(AR) cqs {outs[0]} {ins}"]
-    cxxlibrary = ["$(AR) cqs {outs[0]} {ins}"]
-    cprogram = ["$(CC) -o {outs[0]} {ins} {ldflags} $(LDFLAGS)"]
-    cxxprogram = ["$(CXX) -o {outs[0]} {ins} {ldflags} $(LDFLAGS)"]
+    cfile = ["$(ACKCC) -mcpm -c -o {outs[0]} {ins[0]} $(ACKCFLAGS) {cflags}"]
+    cxxfile = (["false"],)
+    clibrary = ["$(ACKAAL) cq {outs[0]} {ins}"]
+    cxxlibrary = (["false"],)
+    cprogram = ["$(ACKCC) -mcpm -.c -o {outs[0]} {ins} {ldflags} $(ACKLDFLAGS)"]
+    cxxprogram = (["false"],)
+
+
+def acklibrary(**kwargs):
+    return clibrary(**kwargs, toolchain=AckToolchain)
+
 
 def ackprogram(**kwargs):
     return cprogram(**kwargs, toolchain=AckToolchain)
diff --git a/cpmtools/libcuss/build.py b/cpmtools/libcuss/build.py
new file mode 100644
index 0000000..ce5eb3e
--- /dev/null
+++ b/cpmtools/libcuss/build.py
@@ -0,0 +1,31 @@
+from build.ack import acklibrary, ackprogram
+from glob import glob
+
+libcuss_terminals = [
+    "KAYPROII",
+    "NC200",
+    "BROTHEROP2",
+    "BROTHER_WP1",
+    "BROTHER_WP2450DS",
+    "BROTHER_POWERNOTE",
+    "SPECTRUM_PLUS_THREE",
+    "SPECTRUM_NEXT",
+]
+
+for terminal in libcuss_terminals:
+    acklibrary(
+        name="libcuss_" + terminal,
+        cflags=["-DLIBCUSS_" + terminal],
+        srcs=glob("cpmtools/libcuss/*.c"),
+        hdrs={"libcuss.h": "./libcuss.h"},
+    )
+
+
+def libcuss_ackprogram(name, deps=[], cflags=[], **kwargs):
+    for terminal in libcuss_terminals:
+        ackprogram(
+            name=name + "_" + terminal,
+            deps=deps + ["cpmtools/libcuss+libcuss_" + terminal],
+            cflags=["-DLIBCUSS_"+terminal] + cflags,
+            **kwargs
+        )
diff --git a/third_party/ld80/build.py b/third_party/ld80/build.py
index a68efa6..a969694 100644
--- a/third_party/ld80/build.py
+++ b/third_party/ld80/build.py
@@ -39,6 +39,7 @@ def ld80(self, name, address=0x0100, objs: ListOfTargetsMap = {}):
             + (" ".join(args)),
             f"tail -c+{address+1} {{outs[0]}}.all > {{outs[0]}}",
         ],
+        label="LD80",
     )