+dnl ** Mac OS X: explicit deployment target
+dnl --------------------------------------------------------------
+AC_ARG_WITH([macosx-deployment-target],
+[AC_HELP_STRING([--with-macosx-deployment-target=VERSION],
+ [Build for Mac OS VERSION and higher (default= version of build host)])],
+[FP_MACOSX_DEPLOYMENT_TARGET="$withval"
+ if test "x$TargetOS_CPP-$TargetVendor_CPP" != "xdarwin-apple"; then
+ # ignore everywhere, but on Mac OS
+ AC_MSG_WARN([--macosx-deployment-target is only available on Mac OS X])
+ FP_MACOSX_DEPLOYMENT_TARGET=none
+ fi],
+[FP_MACOSX_DEPLOYMENT_TARGET=none]
+)
+FP_CHECK_MACOSX_DEPLOYMENT_TARGET
+AC_SUBST(MACOSX_DEPLOYMENT_VERSION)
+AC_SUBST(MACOSX_DEPLOYMENT_SDK)
+