diff --git a/SheepShaver/src/Unix/Makefile.in b/SheepShaver/src/Unix/Makefile.in
index 8ed7a9d4..7f72f0e7 100644
--- a/SheepShaver/src/Unix/Makefile.in
+++ b/SheepShaver/src/Unix/Makefile.in
@@ -76,7 +76,7 @@ uninstall:
 	rm -f $(man1dir)/$(APP).1
 
 clean:
-	rm -f $(APP) $(OBJ_DIR)/* core* *.core *~ *.bak
+	rm -f $(APP) $(OBJ_DIR)/* core* *.core *~ *.bak ppc-execute-impl.cpp
 
 distclean: clean
 	rm -rf $(OBJ_DIR)
@@ -95,5 +95,12 @@ $(OBJ_DIR)/%.o : %.S
 	$(AS) $(ASFLAGS) -o $@ $*.s
 	rm $*.s
 
+# Kheperix CPU emulator
+GENEXEC = ../kpx_cpu/src/cpu/ppc/genexec.pl
+
+../kpx_cpu/src/cpu/ppc/ppc-execute.cpp: ppc-execute-impl.cpp
+ppc-execute-impl.cpp: ../kpx_cpu/src/cpu/ppc/ppc-decode.cpp $(GENEXEC)
+	$(CPP) $(CPPFLAGS) $< | $(GENEXEC) > $@
+
 #-------------------------------------------------------------------------
 # DO NOT DELETE THIS LINE -- make depend depends on it.