diff -ur a/pppd/Makefile.linux b/pppd/Makefile.linux
--- a/pppd/Makefile.linux	2022-04-30 17:56:16.092083205 +0000
+++ b/pppd/Makefile.linux	2022-04-30 17:56:55.423147553 +0000
@@ -88,7 +88,7 @@
 
 INCLUDE_DIRS= -I../include
 
-COMPILE_FLAGS= -DHAVE_PATHS_H -DIPX_CHANGE -DHAVE_MMAP
+COMPILE_FLAGS= -DHAVE_PATHS_H -DHAVE_MMAP
 
 CFLAGS= $(COPTS) $(COMPILE_FLAGS) $(INCLUDE_DIRS) '-DDESTDIR="@DESTDIR@"'