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	2019-08-11 16:34:20.884222551 +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	2019-08-11 16:34:20.884222551 +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	2019-08-11 16:35:13.888223567 +0800
@@ -33,12 +33,12 @@
 # CC = gcc
 #
 COPTS = -O2 -pipe -Wall -g
-LIBS =
+LIBS = -lpthread
 
-# Uncomment the next 2 lines to include support for Microsoft's
+# Uncomment the next line to include support for Microsoft's
 # MS-CHAP authentication protocol.  Also, edit plugins/radius/Makefile.linux.
 CHAPMS=y
-USE_CRYPT=y
+#USE_CRYPT=y
 # Don't use MSLANMAN unless you really know what you're doing.
 #MSLANMAN=y
 # Uncomment the next line to include support for MPPE.  CHAPMS (above) must
@@ -79,6 +79,7 @@
 MAXOCTETS=y
 
 INCLUDE_DIRS= -I../include
+OPENSSL_INCLUDE_DIR= /usr/include/openssl
 
 COMPILE_FLAGS= -DHAVE_PATHS_H -DIPX_CHANGE -DHAVE_MMAP
 
@@ -132,7 +133,8 @@
 
 ifdef NEEDDES
 ifndef USE_CRYPT
-LIBS     += -ldes $(LIBS)
+CFLAGS   += -I$(OPENSSL_INCLUDE_DIR)
+LIBS     += -lcrypto -lpthread
 else
 CFLAGS   += -DUSE_CRYPT=1
 endif
diff -Nuar ppp-2.4.7/pppd/plugins/rp-pppoe/pppoe.h ppp-2.4.7-fixed/pppd/plugins/rp-pppoe/pppoe.h
--- ppp-2.4.7/pppd/plugins/rp-pppoe/pppoe.h	2014-08-09 20:31:39.000000000 +0800
+++ ppp-2.4.7-fixed/pppd/plugins/rp-pppoe/pppoe.h	2019-08-11 16:34:20.884222551 +0800
@@ -47,6 +47,8 @@
 #include <sys/socket.h>
 #endif
 
+#include <netinet/in.h>
+
 /* Ugly header files on some Linux boxes... */
 #if defined(HAVE_LINUX_IF_H)
 #include <linux/if.h>
@@ -84,8 +86,6 @@
 #include <linux/if_ether.h>
 #endif
 
-#include <netinet/in.h>
-
 #ifdef HAVE_NETINET_IF_ETHER_H
 #include <sys/types.h>
 
diff -Nuar ppp-2.4.7/pppd/pppcrypt.c ppp-2.4.7-fixed/pppd/pppcrypt.c
--- ppp-2.4.7/pppd/pppcrypt.c	2014-08-09 20:31:39.000000000 +0800
+++ ppp-2.4.7-fixed/pppd/pppcrypt.c	2019-08-11 16:34:20.888222551 +0800
@@ -64,7 +64,7 @@
 	des_key[7] = Get7Bits(key, 49);
 
 #ifndef USE_CRYPT
-	des_set_odd_parity((des_cblock *)des_key);
+	DES_set_odd_parity((DES_cblock *)des_key);
 #endif
 }
 
@@ -158,25 +158,25 @@
 }
 
 #else /* USE_CRYPT */
-static des_key_schedule	key_schedule;
+static DES_key_schedule	key_schedule;
 
 bool
 DesSetkey(key)
 u_char *key;
 {
-	des_cblock des_key;
+	DES_cblock des_key;
 	MakeKey(key, des_key);
-	des_set_key(&des_key, key_schedule);
+	DES_set_key(&des_key, &key_schedule);
 	return (1);
 }
 
 bool
-DesEncrypt(clear, key, cipher)
+DesEncrypt(clear, cipher)
 u_char *clear;	/* IN  8 octets */
 u_char *cipher;	/* OUT 8 octets */
 {
-	des_ecb_encrypt((des_cblock *)clear, (des_cblock *)cipher,
-	    key_schedule, 1);
+	DES_ecb_encrypt((DES_cblock *)clear, (DES_cblock *)cipher,
+	    &key_schedule, 1);
 	return (1);
 }
 
@@ -185,8 +185,8 @@
 u_char *cipher;	/* IN  8 octets */
 u_char *clear;	/* OUT 8 octets */
 {
-	des_ecb_encrypt((des_cblock *)cipher, (des_cblock *)clear,
-	    key_schedule, 0);
+	DES_ecb_encrypt((DES_cblock *)cipher, (DES_cblock *)clear,
+	    &key_schedule, 0);
 	return (1);
 }