X-Git-Url: https://git.exim.org/users/jgh/exim.git/blobdiff_plain/870f6ba8a2945754a7f2f66097e3a64465fe1a04..13c7874e0a41d696ecf55774d62ea7d11778414f:/src/OS/Makefile-Linux

diff --git a/src/OS/Makefile-Linux b/src/OS/Makefile-Linux
index 94290f2b9..990f884e9 100644
--- a/src/OS/Makefile-Linux
+++ b/src/OS/Makefile-Linux
@@ -1,15 +1,20 @@
-# $Cambridge: exim/src/OS/Makefile-Linux,v 1.2 2005/05/23 16:58:55 fanf2 Exp $
-
 # Exim: OS-specific make file for Linux. This is for modern Linuxes,
 # which use libc6.
+#
+# For Linux, we assume GNU Make; at time of writing, the only extension
+# used is ?= which is actually portable to other maintained Make variants,
+# just is not POSIX.
 
 HAVE_ICONV=yes
 
 BASENAME_COMMAND=look_for_it
 CHOWN_COMMAND=look_for_it
 CHGRP_COMMAND=look_for_it
+CHMOD_COMMAND=look_for_it
 
-CFLAGS=-O -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE
+# Preserve CFLAGS and CFLAGS_DYNAMIC from the caller/environment
+CFLAGS ?= -O -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE
+CFLAGS_DYNAMIC ?= -shared -rdynamic
 
 DBMLIB = -ldb
 USE_DB = yes