diff -Nru rp-pppoe-3.8.orig/src/configure.in rp-pppoe-3.8/src/configure.in
--- rp-pppoe-3.8.orig/src/configure.in	2008-06-15 16:59:01.000000000 +0300
+++ rp-pppoe-3.8/src/configure.in	2008-06-15 17:12:02.000000000 +0300
@@ -44,7 +44,7 @@
 AC_MSG_RESULT($ac_cv_struct_sockaddr_ll)
 
 if test "$ac_cv_struct_sockaddr_ll" = yes ; then
-AC_DEFINE(HAVE_STRUCT_SOCKADDR_LL)
+AC_DEFINE(HAVE_STRUCT_SOCKADDR_LL, 1, [Define if you have struct sockaddr_ll])
 fi
 
 dnl Check for N_HDLC line discipline
@@ -55,7 +55,7 @@
 	ac_cv_n_hdlc=no)
 AC_MSG_RESULT($ac_cv_n_hdlc)
 if test "$ac_cv_n_hdlc" = yes ; then
-AC_DEFINE(HAVE_N_HDLC)
+AC_DEFINE(HAVE_N_HDLC, 1, [Define if you have the N_HDLC line discipline in linux/termios.h])
 fi
 
 AC_ARG_ENABLE(plugin, [  --enable-plugin=pppd_src_path   build pppd plugin], ac_cv_pluginpath=$enableval, ac_cv_pluginpath=no)
@@ -100,13 +100,13 @@
 if test "$ac_cv_header_linux_if_pppox_h" = yes ; then
 	if test "$ac_cv_pluginpath" != no ; then
 		LINUX_KERNELMODE_PLUGIN=rp-pppoe.so
-		AC_DEFINE(HAVE_LINUX_KERNEL_PPPOE)
+		AC_DEFINE(HAVE_LINUX_KERNEL_PPPOE, 1, [Define if you have kernel-mode PPPoE in Linux file])
 		PPPD_INCDIR=$ac_cv_pluginpath
 	fi
 fi
 
 if test "$ac_cv_debugging" = "yes" ; then
-   AC_DEFINE(DEBUGGING_ENABLED)
+   AC_DEFINE(DEBUGGING_ENABLED, 1, [Define to include debugging code])
 fi
 
 AC_SUBST(LINUX_KERNELMODE_PLUGIN)
@@ -248,7 +248,7 @@
 
 if test "$rpppoe_cv_pack_bitfields" = "rev" ; then
 	AC_MSG_RESULT(reversed)
-	AC_DEFINE(PACK_BITFIELDS_REVERSED)
+	AC_DEFINE(PACK_BITFIELDS_REVERSED, 1, [Define if bitfields are packed in reverse order])
 else
 	AC_MSG_RESULT(normal)
 fi