diff --git a/src/editprop.c b/src/editprop.c
index 76468bd5..3d6ee554 100644
--- a/src/editprop.c
+++ b/src/editprop.c
@@ -136,7 +136,8 @@ size_t my_strdup(int id, char **dest, const char *src) /* empty source string --
 {
  size_t len;
 
- if(*dest == src) dbg(0, "my_strdup(): WARNING: src == *dest == %p, id=%d\n", src, id);
+ if(*dest == src && src!=NULL) 
+   dbg(0, "my_strdup(): WARNING: src == *dest == %p, id=%d\n", src, id);
  if(src!=NULL && src[0]!='\0')  {
    len = strlen(src)+1;
    my_realloc(id, dest, len);
@@ -314,7 +315,8 @@ size_t my_snprintf(char *string, size_t size, const char *format, ...)
 size_t my_strdup2(int id, char **dest, const char *src) /* 20150409 duplicates also empty string  */
 {
  size_t len;
- if(*dest == src) dbg(0, "my_strdup(): WARNING: src == *dest == %p, id=%d\n", src, id);
+ if(*dest == src && src!=NULL) 
+   dbg(0, "my_strdup(): WARNING: src == *dest == %p, id=%d\n", src, id);
  if(src!=NULL) {
    len = strlen(src)+1;
    my_realloc(id, dest, len);
diff --git a/xschem_library/Makefile b/xschem_library/Makefile
index b9debfdc..89401603 100644
--- a/xschem_library/Makefile
+++ b/xschem_library/Makefile
@@ -18,7 +18,7 @@ install: FORCE
 	$(SCCBOX) install -f -d examples/stimuli.* "$(XDOCDIR)"/examples
 	$(SCCBOX) install -f -d binto7seg/*.sym "$(XDOCDIR)"/binto7seg
 	$(SCCBOX) install -f -d binto7seg/*.sch "$(XDOCDIR)"/binto7seg
-	$(SCCBOX) install -f -d generators/*.* "$(XDOCDIR)"/generators
+	$(SCCBOX) install -f -d generators/* "$(XDOCDIR)"/generators
 	$(SCCBOX) install -f -d inst_sch_select/*.* "$(XDOCDIR)"/inst_sch_select
 	$(SCCBOX) install -f -d xTAG/*.sym* "$(XDOCDIR)"/xTAG
 	$(SCCBOX) install -f -d xTAG/*.sch "$(XDOCDIR)"/xTAG