diff --git a/.gitignore b/.gitignore
index a7b0c44..bdcfc11 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,8 +1,2 @@
-/*.o
-/*.do
-/*.a
-/*.da
-/flisp
-/llt/*.o
-/llt/*.a
+/build-*/
 /flisp.boot.bak
diff --git a/Makefile b/Makefile
deleted file mode 100644
index a467b7f..0000000
--- a/Makefile
+++ /dev/null
@@ -1,58 +0,0 @@
-FREEBSD-GE-10 = $(shell test `uname` = FreeBSD -a `uname -r | cut -d. -f1` -ge 10 && echo YES)
-CC = $(if $(FREEBSD-GE-10),clang,gcc)
-
-NAME = flisp
-SRCS = $(NAME).c builtins.c string.c equalhash.c table.c iostream.c
-OBJS = $(SRCS:%.c=%.o)
-DOBJS = $(SRCS:%.c=%.do)
-EXENAME = $(NAME)
-LIBTARGET = lib$(NAME)
-LLTDIR = llt
-LLT = $(LLTDIR)/libllt.a
-
-FLAGS = -falign-functions -Wall -Wno-strict-aliasing -I$(LLTDIR) $(CFLAGS) -DUSE_COMPUTED_GOTO
-LIBFILES = $(LLT)
-LIBS = $(LIBFILES) -lm
-
-DEBUGFLAGS = -g -DDEBUG $(FLAGS)
-SHIPFLAGS = -O2 -DNDEBUG $(FLAGS)
-
-default: release test
-
-test:
-	cd tests && ../flisp unittest.lsp
-
-%.o: %.c
-	$(CC) $(SHIPFLAGS) -c $< -o $@
-%.do: %.c
-	$(CC) $(DEBUGFLAGS) -c $< -o $@
-
-flisp.o:  flisp.c cvalues.c operators.c types.c flisp.h print.c read.c equal.c
-flisp.do: flisp.c cvalues.c operators.c types.c flisp.h print.c read.c equal.c
-flmain.o: flmain.c flisp.h
-flmain.do: flmain.c flisp.h
-
-$(LLT):
-	cd $(LLTDIR) && $(MAKE)
-
-$(LIBTARGET).da: $(DOBJS)
-	rm -rf $@
-	ar rs $@ $(DOBJS)
-
-$(LIBTARGET).a: $(OBJS)
-	rm -rf $@
-	ar rs $@ $(OBJS)
-
-debug: $(DOBJS) $(LIBFILES) $(LIBTARGET).da flmain.do
-	$(CC) $(DEBUGFLAGS) $(DOBJS) flmain.do -o $(EXENAME) $(LIBS) $(LIBTARGET).da
-	$(MAKE) test
-
-release: $(OBJS) $(LIBFILES) $(LIBTARGET).a flmain.o
-	$(CC) $(SHIPFLAGS) $(OBJS) flmain.o -o $(EXENAME) $(LIBS) $(LIBTARGET).a
-
-clean:
-	rm -f *.o
-	rm -f *.do
-	rm -f $(EXENAME)
-	rm -f $(LIBTARGET).a
-	rm -f $(LIBTARGET).da
diff --git a/Makefile.macosx b/Makefile.macosx
deleted file mode 100644
index 7c3f879..0000000
--- a/Makefile.macosx
+++ /dev/null
@@ -1,59 +0,0 @@
-CC ?= gcc
-CARBON_HEADERS ?= "/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.7.sdk/Developer/Headers"
-
-NAME = flisp
-SRCS = $(NAME).c builtins.c string.c equalhash.c table.c iostream.c
-OBJS = $(SRCS:%.c=%.o)
-DOBJS = $(SRCS:%.c=%.do)
-EXENAME = $(NAME)
-LIBTARGET = lib$(NAME)
-LLTDIR = llt
-LLT = $(LLTDIR)/libllt.a
-
-CONFIG = -DBITS64 -D__CPU__=686 -I$(CARBON_HEADERS)
-FLAGS = -falign-functions -Wall -Wno-strict-aliasing -I$(LLTDIR) $(CFLAGS) -DUSE_COMPUTED_GOTO $(CONFIG)
-LIBFILES = $(LLT)
-LIBS = $(LIBFILES) -lm -framework ApplicationServices
-
-DEBUGFLAGS = -g -DDEBUG $(FLAGS)
-SHIPFLAGS = -O2 -DNDEBUG $(FLAGS)
-
-default: release test
-
-test:
-	cd tests && ../flisp unittest.lsp
-
-%.o: %.c
-	$(CC) $(SHIPFLAGS) -c $< -o $@
-%.do: %.c
-	$(CC) $(DEBUGFLAGS) -c $< -o $@
-
-flisp.o:  flisp.c cvalues.c types.c flisp.h print.c read.c equal.c
-flisp.do: flisp.c cvalues.c types.c flisp.h print.c read.c equal.c
-flmain.o: flmain.c flisp.h
-flmain.do: flmain.c flisp.h
-
-$(LLT):
-	cd $(LLTDIR) && make -f Makefile.macosx
-
-$(LIBTARGET).da: $(DOBJS)
-	rm -rf $@
-	ar rs $@ $(DOBJS)
-
-$(LIBTARGET).a: $(OBJS)
-	rm -rf $@
-	ar rs $@ $(OBJS)
-
-debug: $(DOBJS) $(LIBFILES) $(LIBTARGET).da flmain.do
-	$(CC) $(DEBUGFLAGS) $(DOBJS) flmain.do -o $(EXENAME) $(LIBS) $(LIBTARGET).da
-	make test
-
-release: $(OBJS) $(LIBFILES) $(LIBTARGET).a flmain.o
-	$(CC) $(SHIPFLAGS) $(OBJS) flmain.o -o $(EXENAME) $(LIBS) $(LIBTARGET).a
-
-clean:
-	rm -f *.o
-	rm -f *.do
-	rm -f $(EXENAME)
-	rm -f $(LIBTARGET).a
-	rm -f $(LIBTARGET).da
diff --git a/bootstrap.sh b/bootstrap.sh
deleted file mode 100755
index 99effd6..0000000
--- a/bootstrap.sh
+++ /dev/null
@@ -1,14 +0,0 @@
-#!/bin/sh
-
-cp flisp.boot flisp.boot.bak
-
-echo "Creating stage 0 boot file..."
-#../../branches/interpreter/femtolisp/flisp mkboot0.lsp system.lsp compiler.lsp > flisp.boot.new
-./flisp mkboot0.lsp system.lsp compiler.lsp > flisp.boot.new
-mv flisp.boot.new flisp.boot
-
-echo "Creating stage 1 boot file..."
-./flisp mkboot1.lsp
-
-echo "Testing..."
-make test
diff --git a/llt/Makefile b/llt/Makefile
deleted file mode 100644
index 7899f79..0000000
--- a/llt/Makefile
+++ /dev/null
@@ -1,37 +0,0 @@
-FREEBSD-GE-10 = $(shell test `uname` = FreeBSD -a `uname -r | cut -d. -f1` -ge 10 && echo YES)
-CC = $(if $(FREEBSD-GE-10),clang,gcc)
-
-SRCS = bitvector.c hashing.c socket.c timefuncs.c ptrhash.c utf8.c ios.c \
-	dirpath.c htable.c bitvector-ops.c int2str.c dump.c random.c \
-	lltinit.c
-OBJS = $(SRCS:%.c=%.o)
-DOBJS = $(SRCS:%.c=%.do)
-TARGET = libllt.a
-
-FLAGS = -Wall -Wno-strict-aliasing $(CFLAGS)
-LIBS =
-
-DEBUGFLAGS = -g -DDEBUG $(FLAGS)
-SHIPFLAGS = -O3 -DNDEBUG $(FLAGS)
-
-default: release
-
-%.o: %.c
-	$(CC) $(SHIPFLAGS) -c $< -o $@
-%.do: %.c
-	$(CC) $(DEBUGFLAGS) -c $< -o $@
-
-debug: $(DOBJS)
-	rm -rf $(TARGET)
-	ar rs $(TARGET) $(DOBJS)
-
-release: $(OBJS)
-	rm -rf $(TARGET)
-	ar rs $(TARGET) $(OBJS)
-
-clean:
-	rm -f *.o
-	rm -f *.do
-	rm -f *~
-	rm -f core*
-	rm -f $(TARGET)
diff --git a/llt/Makefile.macosx b/llt/Makefile.macosx
deleted file mode 100644
index f20ffc5..0000000
--- a/llt/Makefile.macosx
+++ /dev/null
@@ -1,39 +0,0 @@
-CC = gcc
-
-SRCS = bitvector.c hashing.c socket.c timefuncs.c ptrhash.c utf8.c ios.c \
-	dirpath.c htable.c bitvector-ops.c int2str.c dump.c random.c \
-	lltinit.c
-OBJS = $(SRCS:%.c=%.o)
-DOBJS = $(SRCS:%.c=%.do)
-TARGET = libllt.a
-
-# OS flags: LINUX, WIN32, MACOSX
-# architecture flags: __CPU__=xxx, BITS64, ARCH_X86, ARCH_X86_64
-CONFIG = -DBITS64 -D__CPU__=686
-FLAGS = -Wall -Wno-strict-aliasing $(CFLAGS) $(CONFIG)
-LIBS =
-
-DEBUGFLAGS = -g -DDEBUG $(FLAGS)
-SHIPFLAGS = -O3 -DNDEBUG $(FLAGS)
-
-default: release
-
-%.o: %.c
-	$(CC) $(SHIPFLAGS) -c $< -o $@
-%.do: %.c
-	$(CC) $(DEBUGFLAGS) -c $< -o $@
-
-debug: $(DOBJS)
-	rm -rf $(TARGET)
-	ar rs $(TARGET) $(DOBJS)
-
-release: $(OBJS)
-	rm -rf $(TARGET)
-	ar rs $(TARGET) $(OBJS)
-
-clean:
-	rm -f *.o
-	rm -f *.do
-	rm -f *~
-	rm -f core*
-	rm -f $(TARGET)
diff --git a/scripts/build.sh b/scripts/build.sh
new file mode 100755
index 0000000..e3ea030
--- /dev/null
+++ b/scripts/build.sh
@@ -0,0 +1,56 @@
+#!/bin/sh
+set -eu
+CC="${CC:-clang}"
+CFLAGS="-O2 -falign-functions -Wall -Wno-strict-aliasing -I ../llt -D NDEBUG -D USE_COMPUTED_GOTO"
+LFLAGS="-lm"
+builddir="build-$(uname | tr A-Z- a-z_)-$(uname -m | tr A-Z- a-z_)"
+cd "$(dirname "$0")"/..
+echo "Entering directory '$PWD'"
+set -x
+mkdir -p "$builddir"
+find "$builddir" -mindepth 1 -delete
+{ set +x; } 2>/dev/null
+cd "$builddir"
+echo "Entering directory '$PWD'"
+set -x
+$CC $CFLAGS -c ../builtins.c
+$CC $CFLAGS -c ../equalhash.c
+$CC $CFLAGS -c ../flisp.c
+$CC $CFLAGS -c ../flmain.c
+$CC $CFLAGS -c ../iostream.c
+$CC $CFLAGS -c ../string.c
+$CC $CFLAGS -c ../table.c
+$CC $CFLAGS -c ../llt/bitvector-ops.c
+$CC $CFLAGS -c ../llt/bitvector.c
+$CC $CFLAGS -c ../llt/dirpath.c
+$CC $CFLAGS -c ../llt/dump.c
+$CC $CFLAGS -c ../llt/hashing.c
+$CC $CFLAGS -c ../llt/htable.c
+$CC $CFLAGS -c ../llt/int2str.c
+$CC $CFLAGS -c ../llt/ios.c
+$CC $CFLAGS -c ../llt/lltinit.c
+$CC $CFLAGS -c ../llt/ptrhash.c
+$CC $CFLAGS -c ../llt/random.c
+$CC $CFLAGS -c ../llt/socket.c
+$CC $CFLAGS -c ../llt/timefuncs.c
+$CC $CFLAGS -c ../llt/utf8.c
+$CC $LFLAGS -o flisp -lm \
+    builtins.o equalhash.o flisp.o flmain.o iostream.o string.o table.o \
+    bitvector-ops.o bitvector.o dirpath.o dump.o hashing.o htable.o \
+    int2str.o ios.o lltinit.o ptrhash.o random.o socket.o timefuncs.o utf8.o
+ln -s ../flisp.boot flisp.boot
+{ set +x; } 2>/dev/null
+cd ..
+echo "Entering directory '$PWD'"
+echo "Creating stage 0 boot file..."
+set -x
+"$builddir"/flisp mkboot0.lsp system.lsp compiler.lsp >flisp.boot.new
+mv flisp.boot.new flisp.boot
+{ set +x; } 2>/dev/null
+echo "Creating stage 1 boot file..."
+set -x
+"$builddir"/flisp mkboot1.lsp
+{ set +x; } 2>/dev/null
+cd tests
+echo "Entering directory '$PWD'"
+../"$builddir"/flisp unittest.lsp