Fix CURL_CHECK_DEF so that when the expansion of the preprocessor symbol results

  used to provide support for a curl_off_t data type which is not gated to

  off_t. Further details are documented inside these mentioned header files.

- Fix CURL_CHECK_DEF so that when the expansion of the preprocessor symbol

  results in a set of double-quoted strings, this macro will now return an

  expansion which consists of a single double-quoted string as the result of

  concatenating all of them.

Yang Tse (5 Aug 2008)

- Changes done to buildconf script. Validate that autom4te and autoconf, as

  well as aclocal and automake, versions match. Improve removal of previous

dnl Use the C preprocessor to find out if the given object-style symbol

dnl is defined and get its expansion. This macro will not use default

dnl includes even if no INCLUDES argument is given. This macro will run

dnl silently when invoked with three arguments.

dnl silently when invoked with three arguments. If the expansion would

dnl result in a set of double-quoted strings the returned expansion will

dnl actually be a single double-quoted string concatenating all them.

AC_DEFUN([CURL_CHECK_DEF], [

  AS_VAR_PUSHDEF([ac_HaveDef], [curl_cv_have_def_$1])dnl

    tmp_exp=`eval "$ac_cpp conftest.$ac_ext" 2>/dev/null | \

      "$GREP" CURL_DEF_TOKEN 2>/dev/null | \

      "$SED" 's/.*CURL_DEF_TOKEN[[ ]]//' 2>/dev/null | \

      "$SED" 'q' 2>/dev/null`

      "$SED" 's/[["]][[ ]]*[["]]//g' 2>/dev/null`

    if test "$tmp_exp" = "$1"; then

      tmp_exp=""

    fi