diff --git a/Makefile b/Makefile
index fca9576..49bec6a 100644
--- a/Makefile
+++ b/Makefile
@@ -17,16 +17,22 @@ JS_EXPORTED_FUNCTIONS := javascript/exported_functions.json
 
 PUBLIC_HEADERS := include/olm/olm.h
 
-SOURCES := $(wildcard src/*.cpp) $(wildcard src/*.c)
-RELEASE_OBJECTS := $(patsubst src/%,$(BUILD_DIR)/release/%,$(patsubst %.c,%.o,$(patsubst %.cpp,%.o,$(SOURCES))))
-DEBUG_OBJECTS := $(patsubst src/%,$(BUILD_DIR)/debug/%,$(patsubst %.c,%.o,$(patsubst %.cpp,%.o,$(SOURCES))))
-FUZZER_OBJECTS := $(patsubst src/%,$(BUILD_DIR)/fuzzers/objects/%,$(patsubst %.c,%.o,$(patsubst %.cpp,%.o,$(SOURCES))))
+SOURCES := $(wildcard src/*.cpp) $(wildcard src/*.c) \
+    lib/crypto-algorithms/sha256.c \
+    lib/crypto-algorithms/aes.c \
+    lib/curve25519-donna/curve25519-donna.c
+
 FUZZER_SOURCES := $(wildcard fuzzers/fuzz_*.cpp) $(wildcard fuzzers/fuzz_*.c)
-FUZZER_BINARIES := $(patsubst fuzzers/%,$(BUILD_DIR)/fuzzers/%,$(patsubst %.c,%,$(patsubst %.cpp,%,$(FUZZER_SOURCES))))
-FUZZER_DEBUG_BINARIES := $(patsubst $(BUILD_DIR)/fuzzers/fuzz_%,$(BUILD_DIR)/fuzzers/debug_%,$(FUZZER_BINARIES))
 TEST_SOURCES := $(wildcard tests/test_*.cpp) $(wildcard tests/test_*.c)
-TEST_BINARIES := $(patsubst tests/%,$(BUILD_DIR)/tests/%,$(patsubst %.c,%,$(patsubst %.cpp,%,$(TEST_SOURCES))))
-JS_OBJECTS := $(patsubst src/%,$(BUILD_DIR)/javascript/%,$(patsubst %.c,%.js.bc,$(patsubst %.cpp,%.js.bc,$(SOURCES))))
+
+OBJECTS := $(patsubst %.c,%.o,$(patsubst %.cpp,%.o,$(SOURCES)))
+RELEASE_OBJECTS := $(addprefix $(BUILD_DIR)/release/,$(OBJECTS))
+DEBUG_OBJECTS := $(addprefix $(BUILD_DIR)/debug/,$(OBJECTS))
+FUZZER_OBJECTS := $(addprefix $(BUILD_DIR)/fuzzers/objects/,$(OBJECTS))
+FUZZER_BINARIES := $(addprefix $(BUILD_DIR)/,$(basename $(FUZZER_SOURCES)))
+FUZZER_DEBUG_BINARIES := $(patsubst $(BUILD_DIR)/fuzzers/fuzz_%,$(BUILD_DIR)/fuzzers/debug_%,$(FUZZER_BINARIES))
+TEST_BINARIES := $(patsubst tests/%,$(BUILD_DIR)/tests/%,$(basename $(TEST_SOURCES)))
+JS_OBJECTS := $(addprefix $(BUILD_DIR)/javascript/,$(OBJECTS))
 JS_PRE := $(wildcard javascript/*pre.js)
 JS_POST := $(wildcard javascript/*post.js)
 
@@ -82,14 +88,6 @@ $(JS_TARGET): LDFLAGS += $(JS_OPTIMIZE_FLAGS)
 lib: $(RELEASE_TARGET)
 .PHONY: lib
 
-# Make sure that the build directory exists.
-# We can't check the build directory into git because it is empty.
-makedirs:
-	mkdir -p $(BUILD_DIR)/release $(BUILD_DIR)/debug $(BUILD_DIR)/javascript\
-            $(BUILD_DIR)/tests $(BUILD_DIR)/fuzzers/objects
-.PHONY: makedirs
-
-
 $(RELEASE_TARGET): $(RELEASE_OBJECTS)
 	$(CXX) $(LDFLAGS) --shared -fPIC \
             -Wl,--version-script,version_script.ver \
@@ -112,17 +110,6 @@ $(JS_TARGET): $(JS_OBJECTS) $(JS_PRE) $(JS_POST) $(JS_EXPORTED_FUNCTIONS)
                -s "EXPORTED_FUNCTIONS=@$(JS_EXPORTED_FUNCTIONS)" \
                $(JS_OBJECTS) -o $@
 
-clean:;
-	rm -rf $(RELEASE_OBJECTS) $(RELEASE_OBJECTS:.o=.d) \
-               $(DEBUG_OBJECTS) $(DEBUG_OBJECTS:.o=.d) \
-               $(TEST_BINARIES) $(TEST_BINARIES:=.d) \
-               $(JS_OBJECTS) $(JS_OBJECTS:.bc=.d) $(JS_TARGET) \
-               $(JS_EXPORTED_FUNCTIONS)\
-               $(RELEASE_TARGET) $(DEBUG_TARGET)\
-               $(FUZZER_OBJECTS) $(FUZZER_OBJECTS:.o=.d)\
-               $(FUZZER_BINARIES) $(FUZZER_BINARIES:=.d)\
-               $(FUZZER_DEBUG_BINARIES) $(FUZZER_DEBUG_BINARIES:=.d)\
-
 build_tests: $(TEST_BINARIES)
 
 test: build_tests
@@ -139,37 +126,51 @@ $(JS_EXPORTED_FUNCTIONS): $(PUBLIC_HEADERS)
 	mv $@.tmp $@
 
 all: test js lib debug
-.PHONY: lib
+.PHONY: all
+
+clean:;
+	rm -rf $(BUILD_DIR)
+.PHONY: clean
 
 ### rules for building objects
-$(BUILD_DIR)/release/%.o: src/%.c | makedirs
+$(BUILD_DIR)/release/%.o: %.c
+	mkdir -p $(dir $@)
 	$(COMPILE.c) $(OUTPUT_OPTION) $<
 
-$(BUILD_DIR)/release/%.o: src/%.cpp | makedirs
+$(BUILD_DIR)/release/%.o: %.cpp
+	mkdir -p $(dir $@)
 	$(COMPILE.cc) $(OUTPUT_OPTION) $<
 
-$(BUILD_DIR)/debug/%.o: src/%.c | makedirs
+$(BUILD_DIR)/debug/%.o: %.c
+	mkdir -p $(dir $@)
 	$(COMPILE.c) $(OUTPUT_OPTION) $<
 
-$(BUILD_DIR)/debug/%.o: src/%.cpp | makedirs
+$(BUILD_DIR)/debug/%.o: %.cpp
+	mkdir -p $(dir $@)
 	$(COMPILE.cc) $(OUTPUT_OPTION) $<
 
-$(BUILD_DIR)/javascript/%.js.bc: src/%.c | makedirs
+$(BUILD_DIR)/javascript/%.o: %.c
+	mkdir -p $(dir $@)
 	$(EMCC.c) $(OUTPUT_OPTION) $<
 
-$(BUILD_DIR)/javascript/%.js.bc: src/%.cpp | makedirs
+$(BUILD_DIR)/javascript/%.o: %.cpp
+	mkdir -p $(dir $@)
 	$(EMCC.cc) $(OUTPUT_OPTION) $<
 
 $(BUILD_DIR)/tests/%: tests/%.c $(DEBUG_OBJECTS)
+	mkdir -p $(dir $@)
 	$(LINK.c) $< $(DEBUG_OBJECTS) $(LOADLIBES) $(LDLIBS) -o $@
 
 $(BUILD_DIR)/tests/%: tests/%.cpp $(DEBUG_OBJECTS)
+	mkdir -p $(dir $@)
 	$(LINK.cc) $< $(DEBUG_OBJECTS) $(LOADLIBES) $(LDLIBS) -o $@
 
-$(BUILD_DIR)/fuzzers/objects/%.o: src/%.c | makedirs
+$(BUILD_DIR)/fuzzers/objects/%.o: %.c
+	mkdir -p $(dir $@)
 	$(AFL.c) $(OUTPUT_OPTION) $<
 
-$(BUILD_DIR)/fuzzers/objects/%.o: src/%.cpp | makedirs
+$(BUILD_DIR)/fuzzers/objects/%.o: %.cpp
+	mkdir -p $(dir $@)
 	$(AFL.cc) $(OUTPUT_OPTION) $<
 
 $(BUILD_DIR)/fuzzers/fuzz_%: fuzzers/fuzz_%.c $(FUZZER_OBJECTS)
@@ -188,7 +189,7 @@ $(BUILD_DIR)/fuzzers/debug_%: fuzzers/fuzz_%.cpp $(DEBUG_OBJECTS)
 
 -include $(RELEASE_OBJECTS:.o=.d)
 -include $(DEBUG_OBJECTS:.o=.d)
--include $(JS_OBJECTS:.bc=.d)
+-include $(JS_OBJECTS:.o=.d)
 -include $(TEST_BINARIES:=.d)
 -include $(FUZZER_OBJECTS:.o=.d)
 -include $(FUZZER_BINARIES:=.d)
diff --git a/src/libs.c b/src/ed25519.c
similarity index 87%
rename from src/libs.c
rename to src/ed25519.c
index 4304354..f4f910d 100644
--- a/src/libs.c
+++ b/src/ed25519.c
@@ -12,9 +12,6 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-#include "crypto-algorithms/sha256.c"
-#include "crypto-algorithms/aes.c"
-#include "curve25519-donna/curve25519-donna.c"
 #define select ed25519_select
 #include "ed25519/src/fe.c"
 #include "ed25519/src/sc.c"