diff --git a/cpu/6502/Makefile.6502 b/cpu/6502/Makefile.6502
index 961f714c5e6..ade64d75aec 100644
--- a/cpu/6502/Makefile.6502
+++ b/cpu/6502/Makefile.6502
@@ -68,30 +68,5 @@ CFLAGS += -t $(TARGET) -Or -W -unused-param,-unused-var,-const-comparison
 LDFLAGS = $(STARTADDR_FLAG) -t $(TARGET) -m contiki-$(TARGET).map -D __STACKSIZE__=0x200
 AROPTS  = a
 
-### Compilation rules
-
-.SUFFIXES:
-
-CUSTOM_RULE_C_TO_OBJECTDIR_O = 1
-$(OBJECTDIR)/%.o: %.c | $(OBJECTDIR)
-	$(TRACE_CC)
-	$(Q)$(CC) -c -o $@ $(CFLAGS) --create-dep $(@:.o=.d) $<
-
-CUSTOM_RULE_C_TO_CO = 1
-%.co: %.c
-	$(TRACE_CC)
-	$(Q)$(CC) -c -o $@ $(CFLAGS) -DAUTOSTART_ENABLE --create-dep $(@:.o=.d) $<
-
-CUSTOM_RULE_LINK = 1
-%.$(TARGET): %.co $(PROJECT_OBJECTFILES) $(PROJECT_LIBRARIES) contiki-$(TARGET).a
-	$(TRACE_LD)
-	$(Q)$(LD) -o $@ $(LDFLAGS) -u _main $^ $(TARGET).lib
-
-%.eth: $(OBJECTDIR)/%.o
-	$(TRACE_LD)
-	$(Q)$(LD) -o $@ -t module -m $@.map $<
-
-ifdef ETHERNET
-$(ETHERNET)-eth.S: $(ETHERNET).eth
-	co65 -o $@ --code-label _$(ETHERNET) $<
-endif
+## Default modules
+MODULES += core/net/ipv4
diff --git a/cpu/6502/Makefile.customrules-6502 b/cpu/6502/Makefile.customrules-6502
new file mode 100644
index 00000000000..ce810a352c3
--- /dev/null
+++ b/cpu/6502/Makefile.customrules-6502
@@ -0,0 +1,27 @@
+### Compilation rules
+
+.SUFFIXES:
+
+CUSTOM_RULE_C_TO_OBJECTDIR_O = 1
+$(OBJECTDIR)/%.o: %.c | $(OBJECTDIR)
+	$(TRACE_CC)
+	$(Q)$(CC) -c -o $@ $(CFLAGS) --create-dep $(@:.o=.d) $<
+
+CUSTOM_RULE_C_TO_CO = 1
+%.co: %.c
+	$(TRACE_CC)
+	$(Q)$(CC) -c -o $@ $(CFLAGS) -DAUTOSTART_ENABLE --create-dep $(@:.o=.d) $<
+
+CUSTOM_RULE_LINK = 1
+%.$(TARGET): %.co $(PROJECT_OBJECTFILES) $(PROJECT_LIBRARIES) contiki-$(TARGET).a
+	$(TRACE_LD)
+	$(Q)$(LD) -o $@ $(LDFLAGS) -u _main $^ $(TARGET).lib
+
+%.eth: $(OBJECTDIR)/%.o
+	$(TRACE_LD)
+	$(Q)$(LD) -o $@ -t module -m $@.map $<
+
+ifdef ETHERNET
+$(ETHERNET)-eth.S: $(ETHERNET).eth
+	co65 -o $@ --code-label _$(ETHERNET) $<
+endif
diff --git a/platform/apple2enh/Makefile.customrules-apple2enh b/platform/apple2enh/Makefile.customrules-apple2enh
new file mode 100644
index 00000000000..a9f8d8b1f3d
--- /dev/null
+++ b/platform/apple2enh/Makefile.customrules-apple2enh
@@ -0,0 +1 @@
+include $(CONTIKI_CPU)/Makefile.customrules-6502
diff --git a/platform/atarixl/Makefile.customrules-atarixl b/platform/atarixl/Makefile.customrules-atarixl
new file mode 100644
index 00000000000..a9f8d8b1f3d
--- /dev/null
+++ b/platform/atarixl/Makefile.customrules-atarixl
@@ -0,0 +1 @@
+include $(CONTIKI_CPU)/Makefile.customrules-6502
diff --git a/platform/c128/Makefile.customrules-c128 b/platform/c128/Makefile.customrules-c128
new file mode 100644
index 00000000000..a9f8d8b1f3d
--- /dev/null
+++ b/platform/c128/Makefile.customrules-c128
@@ -0,0 +1 @@
+include $(CONTIKI_CPU)/Makefile.customrules-6502
diff --git a/platform/c64/Makefile.customrules-c64 b/platform/c64/Makefile.customrules-c64
new file mode 100644
index 00000000000..a9f8d8b1f3d
--- /dev/null
+++ b/platform/c64/Makefile.customrules-c64
@@ -0,0 +1 @@
+include $(CONTIKI_CPU)/Makefile.customrules-6502