-diff -urN exim-4.60.org/OS/Makefile-Linux exim-4.60/OS/Makefile-Linux
---- exim-4.60.org/OS/Makefile-Linux 2005-11-28 11:57:32.000000000 +0100
-+++ exim-4.60/OS/Makefile-Linux 2006-02-17 20:17:00.698452750 +0100
-@@ -13,7 +13,7 @@
- CHMOD_COMMAND=look_for_it
-
+--- exim-4.94.org/OS/Makefile-Linux 2020-05-30 22:35:38.000000000 +0200
++++ exim-4.94/OS/Makefile-Linux 2020-11-27 08:08:51.397823884 +0100
+@@ -16,7 +16,7 @@ CHMOD_COMMAND=look_for_it
+ # The system cc may be gcc or clang; do not force gcc
+ CC=cc
# Preserve CFLAGS and CFLAGS_DYNAMIC from the caller/environment
-CFLAGS ?= -O -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE
+CFLAGS ?= -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE $(CUSTOM_CFLAGS)
CFLAGS_DYNAMIC ?= -shared -rdynamic
DBMLIB = -ldb
-