X-Git-Url: https://git.exim.org/exim.git/blobdiff_plain/43ff44e918b762b98b495a91fcd4f0d2f8049bce..a505cf777f90755bce69ab53a899b284a304127b:/src/OS/Makefile-SunOS5

diff --git a/src/OS/Makefile-SunOS5 b/src/OS/Makefile-SunOS5
index 568e99f1c..3b436f4bf 100644
--- a/src/OS/Makefile-SunOS5
+++ b/src/OS/Makefile-SunOS5
@@ -1,6 +1,5 @@
 # Exim: OS-specific make file for SunOS5
-
-CFLAGS=-O
+# Copyright (c) The Exim Maintainers 2020
 
 HAVE_ICONV=yes
 
@@ -20,5 +19,6 @@ XLFLAGS=-L$(X11)/lib -R$(X11)/lib
 X11LIB=$(X11)/lib
 
 OS_C_INCLUDES=setenv.c
+CFLAGS += -D_XOPEN_SOURCE -D_XOPEN_SOURCE_EXTENDED=1 -D__EXTENSIONS__
 
 # End