The examples/client_test program depends on Boost::Regex and

Boost::ProgramOptions. The configure script detects these and builds the
client_test if the necessary libs are found.

m4/ax_boost_regex.m4

@@ -0,0 +1,41 @@
+dnl @synopsis AX_BOOST_REGEX
+dnl
+dnl This macro checks to see if the Boost.Regex library is installed.
+dnl It also attempts to guess the currect library name using several
+dnl attempts.  It tries to build the library name using a user supplied
+dnl name or suffix and then just the raw library.
+dnl
+dnl If the library is found, HAVE_BOOST_REGEX is defined and
+dnl BOOST_REGEX_LIB is set to the name of the library.
+dnl
+dnl This macro calls AC_SUBST(BOOST_REGEX_LIB).
+dnl
+dnl @version $Id$
+dnl @author Michael Tindal <mtindal@paradoxpoint.com>
+dnl
+AC_DEFUN([AX_BOOST_REGEX],
+[AC_REQUIRE([AC_CXX_NAMESPACES])dnl
+AC_CACHE_CHECK(whether the Boost::Regex library is available,
+ax_cv_boost_regex,
+[AC_LANG_SAVE
+ AC_LANG_CPLUSPLUS
+ AC_COMPILE_IFELSE(AC_LANG_PROGRAM([[#include <boost/regex.hpp>]],
+			           [[boost::regex r(); return 0;]]),
+  	           ax_cv_boost_regex=yes, ax_cv_boost_regex=no)
+ AC_LANG_RESTORE
+])
+if test "$ax_cv_boost_regex" = yes; then
+  AC_DEFINE(HAVE_BOOST_REGEX,,[define if the Boost::Regex library is available])
+  dnl Now determine the appropriate file names
+  AC_ARG_WITH([boost-regex],AS_HELP_STRING([--with-boost-regex],
+  [specify the boost regex library or suffix to use]),
+  [if test "x$with_boost_regex" != "xno"; then
+    ax_regex_lib=$with_boost_regex
+    ax_boost_regex_lib=boost_regex-$with_boost_regex
+  fi])
+  for ax_lib in $ax_regex_lib $ax_boost_regex_lib boost_regex; do
+    AC_CHECK_LIB($ax_lib, main, [BOOST_REGEX_LIB=$ax_lib break])
+  done
+  AC_SUBST(BOOST_REGEX_LIB)
+fi
+])dnl