diff -Nru mathopd-1.6b15.orig/src/Makefile mathopd-1.6b15/src/Makefile
--- mathopd-1.6b15.orig/src/Makefile	2013-07-14 11:24:58.467932282 +0200
+++ mathopd-1.6b15/src/Makefile	2013-07-14 11:25:16.330733913 +0200
@@ -1,6 +1,6 @@
 BIN = mathopd
 CC = gcc
-CFLAGS = -O -Wall
+CFLAGS += -Wall
 CPPFLAGS = 
 LDFLAGS = 
 LIBS = -lcrypt
@@ -12,12 +12,12 @@
 # LIBS = -lsocket -lnsl
 
 # On Linux, uncomment the following
-# CPPFLAGS = -DHAVE_CRYPT_H
+CPPFLAGS = -DHAVE_CRYPT_H
 
 # For Linux or Solaris:
 # To add support for large files (>2GB), uncomment the following.
 # You do not need this for 64-bit executables.
-# CPPFLAGS += -D_FILE_OFFSET_BITS=64
+CPPFLAGS += -D_FILE_OFFSET_BITS=64
 
 OBJS = base64.o cgi.o config.o core.o dump.o imap.o log.o main.o \
 	redirect.o request.o util.o stub.o addr.o $(EXTRA_OBJS)
@@ -31,15 +31,15 @@
 # CPPFLAGS += -DNEED_SOCKLEN_T
 
 # Unomment the following if your system has a working vfork() function
-# CPPFLAGS += -DHAVE_VFORK
+CPPFLAGS += -DHAVE_VFORK
 
 # Currently, sendfile support is available in two flavours: Linux and FreeBSD
 # Uncomment one of the following two to enable sendfile() support
-# CPPFLAGS += -DLINUX_SENDFILE
+CPPFLAGS += -DLINUX_SENDFILE
 # CPPFLAGS += -DFREEBSD_SENDFILE
 # If you define any of the SENDFILE conditionals, make sure to uncomment
 # the next line as well.
-# EXTRA_OBJS += sendfile.o
+EXTRA_OBJS += sendfile.o
 
 all: $(BIN)
 install: $(BIN)