diff --git a/src/configure.in b/src/configure.in
index d01379d1dbce8bb0e1a4be0d25b066027bedcd02..72a14549da62188c234cdfb3eebc7baa05ce3f87 100644
--- a/src/configure.in
+++ b/src/configure.in
@@ -1,4 +1,4 @@
-AC_REVISION("$Id: configure.in,v 1.60 1997/03/10 19:13:47 grubba Exp $")
+AC_REVISION("$Id: configure.in,v 1.61 1997/03/12 12:05:48 hubbe Exp $")
 AC_INIT(interpret.c)
 AC_CONFIG_HEADER(machine.h)
 
@@ -423,7 +423,7 @@ if test x$with_threads = xyes ; then
     AC_TRY_RUN([
 #define _REENTRANT
 #define _THREAD_SAFE
-#define _MIT_POSIX_THREADS
+#define _MIT_POSIX_THREADS 1
 #include <thread.h>
 
 void *foo(void *bar) { return ; }
@@ -467,7 +467,7 @@ int main()
       AC_TRY_RUN([
 #define _REENTRANT
 #define _THREAD_SAFE
-#define _MIT_POSIX_THREADS
+#define _MIT_POSIX_THREADS 1
 
 #include <pthread.h>
 
@@ -493,7 +493,7 @@ int main()
       AC_MSG_RESULT(yes)
       AC_DEFINE(_REENTRANT)
       AC_DEFINE(_THREAD_SAFE)
-      AC_DEFINE(_MIT_POSIX_THREADS)
+      AC_DEFINE(_MIT_POSIX_THREADS,1)
       AC_CHECK_FUNCS(pthread_attr_setstacksize pthread_yield \
 		     pthread_cond_init)
       AC_MSG_CHECKING(if pthread_condattr_default is defined)