diff --git a/ChangeLog.GNUstep b/ChangeLog.GNUstep
index 12c9105..a53b296 100644
--- a/ChangeLog.GNUstep
+++ b/ChangeLog.GNUstep
@@ -1,3 +1,8 @@
+2004-02-17  Adam Fedor  <fedor@gnu.org>
+
+	* GNUmakefile: Add defs for darwin.
+	* thr-mach.c: Update include.
+
 2003-11-22  Adam Fedor  <fedor@gnu.org>
 
 	* thr-posix.c (__objc_init_thread_system): Set scope to 
diff --git a/GNUmakefile b/GNUmakefile
index a92c99d..4fdb757 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -57,6 +57,11 @@ endif
 ifeq ($(GNUSTEP_TARGET_OS), cygwin)
 THREADING = win32
 endif
+ifeq ($(findstring darwin, $(GNUSTEP_TARGET_OS)), darwin)      
+THREADING = single
+INTERNAL_CFLAGS += -no-cpp-precomp
+INTERNAL_OBJCFLAGS += -no-cpp-precomp
+endif
 
 GC_HEADER_FILES_DIR = ./gc/include
 GC_HEADER_FILES = \
diff --git a/thr-mach.c b/thr-mach.c
index e954607..2491cb7 100644
--- a/thr-mach.c
+++ b/thr-mach.c
@@ -27,7 +27,7 @@ Boston, MA 02111-1307, USA.  */
    covered by the GNU General Public License.  */
 
 #include <mach/mach.h>
-#include <mach/cthreads.h>
+#include <mach/threads_info.h>
 #include <objc/thr.h>
 #include "runtime.h"