X-Git-Url: https://git.exim.org/exim.git/blobdiff_plain/dfe7d917154afce0e4016a60f142bd540677930f..5c608b75d5bd734ddca41e4468fb22544ef96265:/src/OS/Makefile-SunOS5?ds=inline

diff --git a/src/OS/Makefile-SunOS5 b/src/OS/Makefile-SunOS5
index 351b43ad1..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
 
@@ -19,6 +18,7 @@ XINCLUDE=-I$(X11)/include
 XLFLAGS=-L$(X11)/lib -R$(X11)/lib
 X11LIB=$(X11)/lib
 
-os.o: setenv.c
+OS_C_INCLUDES=setenv.c
+CFLAGS += -D_XOPEN_SOURCE -D_XOPEN_SOURCE_EXTENDED=1 -D__EXTENSIONS__
 
 # End