Various fixes to streamline build process on Mac OS X:

- Give a warning if you're on a case-insensitive filesystem and have
  not specified --with-suffix.
- Don't require --with-dyld, it is now default for OSX/Darwin (suggested
  by Martin v. Loewis)
- Don't define _POSIX_THREADS on Darwin, it's done by standard headers already
  (fix by Tony Lownds)
- Don't use the Mac subtree anymore, the routines relevant to OSX/Darwin
  have moved to a new file Python/mactoolboxglue.c.

configure.in

@@ -44,7 +44,7 @@ fi
 AC_ARG_WITH(next-framework,
 [  --with-next-framework           Build (OpenStep|Rhapsody|MacOSX|Darwin) framework],,)
 AC_ARG_WITH(dyld,
-[  --with-dyld                     Use (OpenStep|Rhapsody|MacOSX|Darwin) dynamic linker],,)
+[  --with-dyld                     Use (OpenStep|Rhapsody) dynamic linker],,)
 
 # Set name for machine-dependent library files
 AC_SUBST(MACHDEP)
@@ -180,6 +180,12 @@ AC_ARG_WITH(suffix, [  --with-suffix=.exe              set executable suffix],[
 	*)	EXEEXT=$withval;;
 	esac])
 AC_MSG_RESULT($EXEEXT)
+# Test whether we're running on a non-case-sensitive system, in which
+# case we give a warning if no ext is given
+if test -d "python" -a -z "$EXEEXT"
+then
+    AC_MSG_WARN(This filesystem is not case-sensitive so you should probably use --with-suffix)
+fi
 
 case $MACHDEP in
 bsdos*)
@@ -703,19 +709,26 @@ else
 fi
 
 AC_MSG_CHECKING(for --with-dyld)
-if test "$with_next_framework" -o "$with_dyld"
-then
-	if test "$with_dyld"
+case $ac_sys_system/$ac_sys_release in
+  Darwin/*)
+  	AC_DEFINE(WITH_DYLD)
+  	AC_MSG_RESULT(always on for Darwin)
+  	;;
+  *)
+	if test "$with_next_framework" -o "$with_dyld"
 	then
-		AC_MSG_RESULT(yes)
+		if test "$with_dyld"
+		then
+			AC_MSG_RESULT(yes)
+		else
+			AC_MSG_RESULT(required for framework build)
+		fi
+		AC_DEFINE(WITH_DYLD)
+		ns_dyld='set'
 	else
-		AC_MSG_RESULT(required for framework build)
-	fi
-	AC_DEFINE(WITH_DYLD)
-	ns_dyld='set'
-else
-	AC_MSG_RESULT(no)
-fi
+		AC_MSG_RESULT(no)
+	fi ;;
+esac
 
 # Set info about shared libraries.
 AC_SUBST(SO)
@@ -762,7 +775,12 @@ then
 	hp*|HP*) LDSHARED="ld -b";;
 	OSF*) LDSHARED="ld -shared -expect_unresolved \"*\"";;
 	DYNIX/ptx*) LDSHARED="ld -G";;
-        Darwin/*|next/*) 
+        Darwin/*) 
+		LDSHARED='$(CC) $(LDFLAGS) -bundle -undefined suppress'
+		if test "$with_next_framework" ; then
+		    LDSHARED="$LDSHARED \$(LDLIBRARY)"
+		fi ;;
+        next/*) 
 		if test "$ns_dyld"
 		then LDSHARED='$(CC) $(LDFLAGS) -bundle -undefined suppress'
 		else LDSHARED='$(CC) $(CFLAGS) -nostdlib -r';
@@ -1003,7 +1021,10 @@ else
     LIBOBJS="$LIBOBJS thread.o"],[
     AC_MSG_RESULT(no)
     AC_CHECK_LIB(pthread, pthread_create, [AC_DEFINE(WITH_THREAD)
-    AC_DEFINE(_POSIX_THREADS)
+    case $ac_sys_system in
+      Darwin*) ;;
+      *) AC_DEFINE(_POSIX_THREADS);;
+    esac
     LIBS="-lpthread $LIBS"
     LIBOBJS="$LIBOBJS thread.o"],[
     AC_CHECK_FUNC(pthread_detach, [AC_DEFINE(WITH_THREAD)
@@ -1166,7 +1187,7 @@ if test -z "$MACHDEP_OBJS"
 then
 	case $ac_sys_system/$ac_sys_release in
 	Darwin/*)
-		MACHDEP_OBJS="Mac/Python/macglue.o"
+		MACHDEP_OBJS="Python/mactoolboxglue.o"
 		AC_DEFINE(USE_TOOLBOX_OBJECT_GLUE)
 		;;
 	*) MACHDEP_OBJS="";;