dnl AC_CHECK_HEADERS(ostream istream sstream locale limits ios)
dnl LYX_CXX_STL_MODERN_STREAMS
+### Objective-C compiler
+AC_PROG_OBJC
+_AM_DEPENDENCIES([OBJC])
+
### and now some special lyx flags.
AC_ARG_ENABLE(assertions,
AC_HELP_STRING([--enable-assertions],[add runtime sanity checks in the program]),,