+dnl Do you want client-side support for apop?
+AC_ARG_ENABLE(apop,
+[ --enable-apop enable client-side support for POP3 and APOP])
+if test x"$enable_apop" = x"yes"; then
+ AC_DEFINE(APOP)dnl
+ APOPLIB=md5.o
+ enable_pop=yes
+fi
+AC_SUBST(APOPLIB)dnl
+