diff -Nuar ppp-2.4.7/chat/Makefile.linux ppp-2.4.7-fixed/chat/Makefile.linux
--- ppp-2.4.7/chat/Makefile.linux	2014-08-09 20:31:39.000000000 +0800
+++ ppp-2.4.7-fixed/chat/Makefile.linux	2019-08-02 12:47:14.580689353 +0800
@@ -21,7 +21,7 @@
 	$(CC) -o chat chat.o
 
 chat.o:	chat.c
-	$(CC) -c $(CFLAGS) -o chat.o chat.c
+	$(CC) -c $(CFLAGS) -static -o chat.o chat.c
 
 install: chat
 	mkdir -p $(BINDIR) $(MANDIR)
diff -Nuar ppp-2.4.7/pppd/auth.c ppp-2.4.7-fixed/pppd/auth.c
--- ppp-2.4.7/pppd/auth.c	2014-08-09 20:31:39.000000000 +0800
+++ ppp-2.4.7-fixed/pppd/auth.c	2019-08-02 12:48:41.600691022 +0800
@@ -1322,7 +1322,8 @@
     int hadchap;
 
     hadchap = -1;
-    ao->neg_upap = !refuse_pap && (passwd[0] != 0 || get_pap_passwd(NULL));
+    /* modify by guowenxue, add don't set passwd support */
+    ao->neg_upap = !refuse_pap; // && (passwd[0] != 0 || get_pap_passwd(NULL));
     ao->neg_chap = (!refuse_chap || !refuse_mschap || !refuse_mschap_v2)
 	&& (passwd[0] != 0 ||
 	    (hadchap = have_chap_secret(user, (explicit_remote? remote_name:
diff -Nuar ppp-2.4.7/pppd/Makefile.linux ppp-2.4.7-fixed/pppd/Makefile.linux
--- ppp-2.4.7/pppd/Makefile.linux	2014-08-09 20:31:39.000000000 +0800
+++ ppp-2.4.7-fixed/pppd/Makefile.linux	2019-08-02 12:48:18.064690571 +0800
@@ -43,12 +43,12 @@
 #MSLANMAN=y
 # Uncomment the next line to include support for MPPE.  CHAPMS (above) must
 # also be enabled.  Also, edit plugins/radius/Makefile.linux.
-MPPE=y
+#MPPE=y
 
 # Uncomment the next line to include support for PPP packet filtering.
 # This requires that the libpcap library and headers be installed
 # and that the kernel driver support PPP packet filtering.
-FILTER=y
+#FILTER=y
 
 # Uncomment the next line to enable multilink PPP (enabled by default)
 # Linux distributions: Please leave multilink ENABLED in your builds
@@ -62,10 +62,10 @@
 
 HAS_SHADOW=y
 #USE_PAM=y
-HAVE_INET6=y
+#HAVE_INET6=y
 
 # Enable plugins
-PLUGIN=y
+#PLUGIN=y
 
 # Enable Microsoft proprietary Callback Control Protocol
 #CBCP=y