diff --git a/.github/workflows/build-and-test.yml b/.github/workflows/build-and-test.yml
index 4c9dc4d..387839f 100644
--- a/.github/workflows/build-and-test.yml
+++ b/.github/workflows/build-and-test.yml
@@ -40,12 +40,15 @@ jobs:
         run: |
           mkdir -p ${DYLAN}
           make install
+          ls -l ${DYLAN}/bin/
+          ldd ${DYLAN}/bin/deft
 
       - name: Exercise deft
         env:
           DYLAN_CATALOG: ext/pacman-catalog
           DYLAN: dylan-root
         run: |
+          find ${DYLAN} -print
           exe="$(realpath ${DYLAN}/bin/deft)"
           export DYLAN_CATALOG="$(realpath ${DYLAN_CATALOG})"
           ${exe} new library --force-package abc strings@1.1
@@ -55,3 +58,11 @@ jobs:
           ${exe} list
           ${exe} build abc-test-suite
           _build/bin/abc-test-suite
+
+      - name: Run test suite using submodules
+        env:
+          DYLAN_CATALOG: ext/pacman-catalog
+          DYLAN: dylan-root
+        run: |
+          mkdir -p ${DYLAN}
+          make test-submodules
diff --git a/Makefile b/Makefile
index cde1aa6..d69aa39 100644
--- a/Makefile
+++ b/Makefile
@@ -1,39 +1,40 @@
 # Low-tech Makefile to build and install deft.
 
 DYLAN		?= $${HOME}/dylan
-install_dir     = $(DYLAN)/install/deft
-install_bin     = $(install_dir)/bin
-install_lib     = $(install_dir)/lib
-link_target     = $(install_bin)/deft-app
-link_source     = $(DYLAN)/bin/dylan
 
 git_version := "$(shell git describe --tags --always --match 'v*')"
 
-.PHONY: build build-with-version clean install install-debug really-install remove-deft-artifacts test dist distclean
+.PHONY: build build-with-version clean install install-debug really-install remove-deft-artifacts test test-submodules dist distclean
 
 build: remove-deft-artifacts
-	OPEN_DYLAN_USER_REGISTRIES=${PWD}/registry dylan-compiler -build -unify deft-app
+	OPEN_DYLAN_USER_REGISTRIES=${PWD}/registry dylan-compiler -build deft-app
 
 # Hack to add the version to the binary with git tag info. Don't want this to
 # be the normal build because it causes unnecessary rebuilds.
 build-with-version: remove-deft-artifacts
 	file="sources/commands/utils.dylan"; \
-	  orig=$$(mktemp); \
+	  saved=$$(mktemp); \
 	  temp=$$(mktemp); \
-	  cp -p $${file} $${orig}; \
+	  cp -p $${file} $${saved}; \
 	  cat $${file} | sed "s,/.__./.*/.__./,/*__*/ \"${git_version}\" /*__*/,g" > $${temp}; \
 	  mv $${temp} $${file}; \
 	  OPEN_DYLAN_USER_REGISTRIES=${PWD}/registry \
-	    dylan-compiler -build -unify deft-app; \
-	  cp -p $${orig} $${file}
+	    dylan-compiler -build deft-app; \
+	  cp -p $${saved} $${file}
 
 # Until the install-deft GitHub Action is no longer referring to deft-app
 # we also create a link named deft-app.
 really-install:
 	mkdir -p $(DYLAN)/bin
-	cp _build/sbin/deft-app $(DYLAN)/bin/deft
-	ln -f $(DYLAN)/bin/deft $(DYLAN)/bin/deft-app
-	ln -f $(DYLAN)/bin/deft $(DYLAN)/bin/dylan
+	mkdir -p $(DYLAN)/install/deft/bin
+	mkdir -p $(DYLAN)/install/deft/lib
+	cp _build/bin/deft-app $(DYLAN)/install/deft/bin/deft
+	cp -r _build/lib/lib* $(DYLAN)/install/deft/lib/
+	# For unified exe these can be hard links; for now they must be symlinks.
+	ln -s -f $(DYLAN)/install/deft/bin/deft $(DYLAN)/bin/deft
+	# For temp backward compatibility...
+	ln -s -f $(DYLAN)/install/deft/bin/deft $(DYLAN)/bin/deft-app
+	ln -s -f $(DYLAN)/install/deft/bin/deft $(DYLAN)/bin/dylan
 
 install: build-with-version really-install
 
@@ -42,11 +43,17 @@ install-debug: build really-install
 
 # Deft needs to be buildable with submodules so that it can be built on
 # new platforms without having to manually install deps.
-test: build
+test:
 	OPEN_DYLAN_USER_REGISTRIES=${PWD}/registry \
 	  dylan-compiler -build deft-test-suite \
 	  && DYLAN_CATALOG=ext/pacman-catalog _build/bin/deft-test-suite
 
+# Deft also needs to be buildable with submodules so that it can be built on new
+# platforms without having to manually install deps.
+test-submodules: distclean
+	dylan-compiler -build deft-test-suite \
+	  && DYLAN_CATALOG=ext/pacman-catalog _build/bin/deft-test-suite
+
 dist: distclean install
 
 # Sometimes I use deft to develop deft, so this makes sure to clean
@@ -58,7 +65,6 @@ remove-deft-artifacts:
 clean: remove-deft-artifacts
 	rm -rf _build
 	rm -rf _test
+	rm -rf *~
 
 distclean: clean
-	rm -rf $(install_dir)
-	rm -f $(link_source)