--- a/configure.in
+++ b/configure.in
@@ -969,17 +969,16 @@ MOZ_ARG_ENABLE_STRING(macos-target,
                           Set the minimum MacOS version needed at runtime],
                       [_MACOSX_DEPLOYMENT_TARGET=$enableval])
 
 case "$target" in
 *-darwin*)
     if test -n "$_MACOSX_DEPLOYMENT_TARGET" ; then
         dnl Use the specified value
         export MACOSX_DEPLOYMENT_TARGET=$_MACOSX_DEPLOYMENT_TARGET
-        AC_DEFINE_UNQUOTED(__ENVIRONMENT_MAC_OS_X_VERION_MIN_REQUIRED__,$_MACOSX_DEPLOYMENT_TARGET)
     else
         dnl No value specified on the command line or in the environment,
         dnl use architecture minimum.
         case "${target_cpu}" in
           ppc*)
             export MACOSX_DEPLOYMENT_TARGET=10.5
             ;;
           i*86)