* Checks that the SDK specified with --enable-universalsk=VALUE exists.

* Fall back to the default system SDK when specifying --enable-universalsk
  without a value and the 10.4u SDK is not avaiable.

Port of fix for issue 4834 from the trunk.

configure

 #! /bin/sh
-# From configure.in Revision: 77862 .
+# From configure.in Revision: 78066 .
 # Guess values for system-dependent variables and create Makefiles.
 # Generated by GNU Autoconf 2.61 for python 3.2.
 #
@@ -1886,12 +1886,18 @@ define_xopen_source=yes
 
 CONFIG_ARGS="$ac_configure_args"
 
+{ echo "$as_me:$LINENO: checking for --enable-universalsdk" >&5
+echo $ECHO_N "checking for --enable-universalsdk... $ECHO_C" >&6; }
 # Check whether --enable-universalsdk was given.
 if test "${enable_universalsdk+set}" = set; then
   enableval=$enable_universalsdk;
 	case $enableval in
 	yes)
 		enableval=/Developer/SDKs/MacOSX10.4u.sdk
+		if test ! -d "${enableval}"
+		then
+			enableval=/
+		fi
 		;;
 	esac
 	case $enableval in
@@ -1901,9 +1907,16 @@ if test "${enable_universalsdk+set}" = set; then
 		;;
 	*)
 		UNIVERSALSDK=$enableval
+		if test ! -d "${UNIVERSALSDK}"
+		then
+			{ { echo "$as_me:$LINENO: error: --enable-universalsdk specifies non-existing SDK: ${UNIVERSALSDK}" >&5
+echo "$as_me: error: --enable-universalsdk specifies non-existing SDK: ${UNIVERSALSDK}" >&2;}
+   { (exit 1); exit 1; }; }
+		fi
 		;;
 	esac
 
+
 else
 
    	UNIVERSALSDK=
@@ -1911,6 +1924,14 @@ else
 
 fi
 
+if test -n "${UNIVERSALSDK}"
+then
+	{ echo "$as_me:$LINENO: result: ${UNIVERSALSDK}" >&5
+echo "${ECHO_T}${UNIVERSALSDK}" >&6; }
+else
+	{ echo "$as_me:$LINENO: result: no" >&5
+echo "${ECHO_T}no" >&6; }
+fi
 
 
 

configure.in

@@ -86,12 +86,17 @@ define_xopen_source=yes
 AC_SUBST(CONFIG_ARGS)
 CONFIG_ARGS="$ac_configure_args"
 
+AC_MSG_CHECKING([for --enable-universalsdk])
 AC_ARG_ENABLE(universalsdk,
 	AC_HELP_STRING(--enable-universalsdk@<:@=SDKDIR@:>@, Build against Mac OS X 10.4u SDK (ppc/i386)),
 [
 	case $enableval in
 	yes)
 		enableval=/Developer/SDKs/MacOSX10.4u.sdk
+		if test ! -d "${enableval}"
+		then
+			enableval=/
+		fi
 		;;
 	esac
 	case $enableval in
@@ -101,12 +106,23 @@ AC_ARG_ENABLE(universalsdk,
 		;;
 	*)
 		UNIVERSALSDK=$enableval
+		if test ! -d "${UNIVERSALSDK}"
+		then
+			AC_MSG_ERROR([--enable-universalsdk specifies non-existing SDK: ${UNIVERSALSDK}])
+		fi
 		;;
 	esac
+	
 ],[
    	UNIVERSALSDK=
 	enable_universalsdk=
 ])
+if test -n "${UNIVERSALSDK}"
+then
+	AC_MSG_RESULT(${UNIVERSALSDK})
+else
+	AC_MSG_RESULT(no)
+fi
 AC_SUBST(UNIVERSALSDK)
 
 AC_SUBST(ARCH_RUN_32BIT)