--- ./Makefile.in.orig	2000-05-24 21:53:11.000000000 +0200
+++ ./Makefile.in	2013-10-01 12:32:37.000000000 +0200
@@ -1,7 +1,7 @@
-DEFINES = @DEFS@
+DEFINES = @DEFS@ -DDEFAULT_DOMAIN=1 -DPIPECOMMAND='"/usr/sbin/sendmail -bs %s"'
 LIBS = @LIBS@
 
-CFLAGS = $(DEFINES)
+CFLAGS += -Wall $(DEFINES)
 
 FILES = bulk_mailer.README INSTALL bulk_mailer.c patchlevel.h Makefile.in