diff --git a/hs20/client/Makefile b/hs20/client/Makefile
index cc2af03..4dcfe2d 100644
--- a/hs20/client/Makefile
+++ b/hs20/client/Makefile
@@ -1,28 +1,6 @@
-all: hs20-osu-client
+ALL=hs20-osu-client
 
-ifndef CC
-CC=gcc
-endif
-
-ifndef LDO
-LDO=$(CC)
-endif
-
-ifeq ($(QUIET), 1)
-Q=@
-E=true
-else
-Q=@
-E=echo
-ifeq ($(V), 1)
-Q=
-E=true
-endif
-endif
-
-ifndef CFLAGS
-CFLAGS = -MMD -O2 -Wall -g
-endif
+include ../../src/build.rules
 
 CFLAGS += -I../../src/utils
 CFLAGS += -I../../src/common
@@ -93,23 +71,11 @@
 OBJS += ../../src/crypto/tls_openssl_ocsp.o
 LIBS += -lssl -lcrypto
 
+_OBJS_VAR := OBJS
+include ../../src/objs.mk
 hs20-osu-client: $(OBJS)
 	$(Q)$(LDO) $(LDFLAGS) -o hs20-osu-client $(OBJS) $(LIBS)
 	@$(E) "  LD " $@
 
-%.o: %.c
-	$(Q)$(CC) -c -o $@ $(CFLAGS) $<
-	@$(E) "  CC " $<
-
-clean:
-	rm -f core *~ *.o *.d hs20-osu-client
-	rm -f ../../src/utils/*.o
-	rm -f ../../src/utils/*.d
-	rm -f ../../src/common/*.o
-	rm -f ../../src/common/*.d
-	rm -f ../../src/crypto/*.o
-	rm -f ../../src/crypto/*.d
-	rm -f ../../src/wps/*.o
-	rm -f ../../src/wps/*.d
-
--include $(OBJS:%.o=%.d)
+clean: common-clean
+	rm -f core *~
diff --git a/hs20/server/.gitignore b/hs20/server/.gitignore
new file mode 100644
index 0000000..fecb096
--- /dev/null
+++ b/hs20/server/.gitignore
@@ -0,0 +1 @@
+hs20_spp_server
diff --git a/hs20/server/Makefile b/hs20/server/Makefile
index 9b73727..0cab6d6 100644
--- a/hs20/server/Makefile
+++ b/hs20/server/Makefile
@@ -1,16 +1,6 @@
-all: hs20_spp_server
+ALL=hs20_spp_server
 
-ifndef CC
-CC=gcc
-endif
-
-ifndef LDO
-LDO=$(CC)
-endif
-
-ifndef CFLAGS
-CFLAGS = -MMD -O2 -Wall -g
-endif
+include ../../src/build.rules
 
 CFLAGS += -I../../src
 CFLAGS += -I../../src/utils
@@ -43,14 +33,10 @@
 LIBS += $(shell xml2-config --libs)
 OBJS += ../../src/utils/xml_libxml2.o
 
+_OBJS_VAR := OBJS
+include ../../src/objs.mk
 hs20_spp_server: $(OBJS)
 	$(LDO) $(LDFLAGS) -o hs20_spp_server $(OBJS) $(LIBS)
 
-clean:
-	rm -f core *~ *.o *.d hs20_spp_server
-	rm -f ../../src/utils/*.o
-	rm -f ../../src/utils/*.d
-	rm -f ../../src/crypto/*.o
-	rm -f ../../src/crypto/*.d
-
--include $(OBJS:%.o=%.d)
+clean: common-clean
+	rm -f core *~