diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index bc5506b..a95b602 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -29,3 +29,9 @@ jobs:
 
     - name: Tangle
       run: nix-shell --run 'make tangle'
+
+    - name: Build lib
+      run: nix-shell --run 'make lib'
+
+    - name: Build bench
+      run: nix-shell --run 'make lib'
diff --git a/Makefile b/Makefile
index 5c12e14..e885a22 100644
--- a/Makefile
+++ b/Makefile
@@ -8,11 +8,29 @@ include ./etc/config/$(CONFIG).mk
 include ./bench/config.mk
 
 MAIN = README.org
+OBJ_FILES = $(patsubst %.cxx,%.o,$(filter-out %.hpp,$(SOURCES)))
+DEP_FILES = $(patsubst %.o,%.d,$(OBJ_FILES))
+SHARED_LIBRARY = lib/libatrip.so
+STATIC_LIBRARY = lib/libatrip.a
+
+lib: ctf
+lib: $(SHARED_LIBRARY) $(STATIC_LIBRARY)
+
+$(SHARED_LIBRARY): $(OBJ_FILES)
+	mkdir -p $(@D)
+	$(CXX) -shared $< $(CXXFLAGS) $(LDFLAGS) -o $@
+
+$(STATIC_LIBRARY): $(OBJ_FILES)
+	mkdir -p $(@D)
+	$(AR) rcs $@ $<
 
 $(SOURCES_FILE): $(MAIN) config.el
 	echo -n "SOURCES = " > $@
 	$(EMACS) --eval '(atrip-print-sources)' >> $@
 
+print:
+	$(info $(filter-out %.hpp,$(SOURCES)))
+
 $(SOURCES): $(MAIN)
 	$(call tangle,$<)
 
@@ -33,3 +51,5 @@ bench: $(BENCH_TARGETS)
 %.o: %.cxx
 	$(CXX) -c $< $(CXXFLAGS) -o $@
 
+%.d: %.cxx
+	$(CXX) -M $< $(CXXFLAGS) -o $@
diff --git a/bench/config.mk b/bench/config.mk
index 4e09f2f..6ce132a 100644
--- a/bench/config.mk
+++ b/bench/config.mk
@@ -3,5 +3,7 @@ BENCH_TARGETS = $(patsubst %.cxx,%,$(BENCH_SOURCES))
 
 $(BENCH_TARGETS): CXXFLAGS += -I.
 $(BENCH_TARGETS): CXXFLAGS += -fopenmp
+$(BENCH_TARGETS): lib
 bench-clean:
 	-rm -v $(BENCH_TARGETS)
+
diff --git a/config.el b/config.el
index f837321..290ca58 100644
--- a/config.el
+++ b/config.el
@@ -29,6 +29,7 @@
 (atrip-def-hdr atrip-unions-h "Unions.hpp")
 (atrip-def-hdr atrip-tuples-h "Tuples.hpp")
 (atrip-def-hdr atrip-equations-h "Equations.hpp")
+(atrip-def-hdr atrip-debug-h "Debug.hpp")
 
 (atrip-def-hdr atrip-atrip-h "Atrip.hpp")
 (atrip-def-src atrip-atrip-cxx "Atrip.cxx")
diff --git a/shell.nix b/shell.nix
index 5550b0d..4630cd4 100644
--- a/shell.nix
+++ b/shell.nix
@@ -10,10 +10,15 @@ pkgs.mkShell rec {
     gcc
     blas
     openmpi
+    mpi
 
     emacs
   ];
 
+  openblas =  pkgs.openblas.override {
+    enableStatic = true;
+  };
+
   scalapack = import ./etc/nix/scalapack.nix {
     lib = pkgs.lib;
     stdenv = pkgs.stdenv;
@@ -29,6 +34,7 @@ pkgs.mkShell rec {
   shellHook = ''
     export LAPACK_PATH=${pkgs.lapack}
     export BLAS_PATH=${pkgs.blas}
+    export OPENBLAS_PATH=${openblas}
     export SCALAPACK_PATH=${scalapack}
     export LD_LIBRARY_PATH=${scalapack}/lib:$LD_LIBRARY_PATH
   '';