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+dnl @synopsis AX_CXX_CHECK_LIB(libname, functioname, action-if, action-if-not)
+dnl
+dnl The standard AC_CHECK_LIB can not test functions in namespaces.
+dnl Therefore AC_CHECK_LIB(cgicc, cgicc::Cgicc::getVersion) will always
+dnl fail. We need to decompose the functionname into a series of namespaces
+dnl where it gets declared so that it can be used for a link test.
+dnl
+dnl In the first version I did allow namespace::functionname to be a
+dnl reference to a void-argument global functionname (just wrapped in a
+dnl namespace) like its C counterparts would be - but in reality such
+dnl thing does not exist. The only global / static functions are always
+dnl made const-functions which is an attribute mangled along into the
+dnl library function export name. 
+dnl
+dnl The normal usage will ask for a test of a class-member function which
+dnl should be presented with a full function spec with arguments given in 
+dnl parentheses following the function name - if the function to test for 
+dnl does expect arguments then you should add default initial values in the 
+dnl prototype (even if they do not exist originally, these are used only 
+dnl locally to build a correct function call in the configure test script).
+dnl
+dnl In the current version if you do omit the parenthesis from the macro
+dnl argument then the macro will assume that you want to check for the
+dnl class name - which is really to check for default constructor being
+dnl exported from the given library name. 
+dnl
+dnl   EXAMPLE:
+dnl AX_CXX_CHECK_LIB(cgicc, [cgicc::HTTPCookie])
+dnl AX_CXX_CHECK_LIB(cgicc, [cgicc::Cgicc::getVersion () const],
+dnl AX_CXX_CHECK_LIB(boost_regex, [boost::RegEx::Position (int i = 0) const])
+dnl
+dnl Result:
+dnl Just as the usual AX_CXX_CHECK_LIB - defines HAVE_LIBCGICC 
+dnl and adds the libraries to the default library path (and
+dnl uses internally the normal ac_check_lib cache symbol
+dnl like ac_cv_lib_cgicc_cgicc__Cgicc)
+dnl
+dnl Footnote: The C++ language is not good at creating stable library
+dnl interfaces at the binary level - a lot of functionality is usually being 
+dnl given as inline functions plus there is hardly a chance to create opaque 
+dnl types. Therefore most C++ library tests will only do compile tests using
+dnl the header files. Doing a check_lib is however good to check the link
+dnl dependency before hitting it as an error in the build later.
+dnl
+dnl @category C++
+dnl @author Guido U. Draheim
+dnl @vesion 2006-12-18
+
+AC_DEFUN([AX_CXX_CHECK_LIB],
+[m4_ifval([$3], , [AH_CHECK_LIB([$1])])dnl
+AS_LITERAL_IF([$1],
+	      [AS_VAR_PUSHDEF([ac_Lib], [ac_cv_lib_$1_$2])],
+	      [AS_VAR_PUSHDEF([ac_Lib], [ac_cv_lib_$1''_$2])])dnl
+AC_CACHE_CHECK([for $2 in -l$1], ac_Lib,
+[ac_check_lib_save_LIBS=$LIBS
+LIBS="-l$1 $5 $LIBS"
+case "$2" 
+in *::*::*\(*)
+AC_LINK_IFELSE([AC_LANG_PROGRAM([
+ namespace `echo "$2" | sed -e "s/::.*//"` 
+ { class `echo "$2" | sed -e "s/.*::\\(.*\\)::.*/\\1/" -e "s/(.*//"` 
+   { public: int `echo "$2" | sed -e "s/.*:://" -e "/(/!s/..*/&()/"`;
+   };
+ }
+],[`echo "$2" | sed  -e "s/(.*//" -e "s/\\(.*\\)::\\(.*\\)/((\\1*)(0))->\\2/g"`()])],
+	       [AS_VAR_SET(ac_Lib, yes)],
+	       [AS_VAR_SET(ac_Lib, no)])
+;; *::*::*)
+AC_LINK_IFELSE([AC_LANG_PROGRAM([
+ namespace `echo "$2" | sed -e "s/::.*//"` 
+ { namespace `echo "$2" | sed -e "s/.*::\\(.*\\)::.*/\\1/"` 
+   { class `echo "$2" | sed -e "s/.*:://"` 
+      { public: `echo "$2" | sed -e "s/.*:://"` ();
+      };
+   }
+ }
+],[new $2()])],
+	       [AS_VAR_SET(ac_Lib, yes)],
+	       [AS_VAR_SET(ac_Lib, no)])
+;; *::*\(*)
+AC_LINK_IFELSE([AC_LANG_PROGRAM([
+ class `echo "$2" | sed -e "s/\\(.*\\)::.*/\\1/" -e "s/(.*//"` 
+   { public: int `echo "$2" | sed -e "s/.*:://" -e "/(/!s/..*/&()/"`;
+   };
+],[`echo "$2" | sed  -e "s/(.*//" -e "s/\\(.*\\)::\\(.*\\)/((\\1*)(0))->\\2/g"`()])],
+	       [AS_VAR_SET(ac_Lib, yes)],
+	       [AS_VAR_SET(ac_Lib, no)])
+;; *::*)
+AC_LINK_IFELSE([AC_LANG_PROGRAM([
+ namespace `echo "$2" | sed -e "s/::.*//"` 
+ { class `echo "$2" | sed -e "s/.*:://"`
+   { public: `echo "$2" | sed -e "s/.*:://"` ();
+   };
+ }
+],[new $2()])],
+	       [AS_VAR_SET(ac_Lib, yes)],
+	       [AS_VAR_SET(ac_Lib, no)])
+;; *)
+AC_LINK_IFELSE([AC_LANG_CALL([], [$2])],
+	       [AS_VAR_SET(ac_Lib, yes)],
+	       [AS_VAR_SET(ac_Lib, no)])
+;; esac
+LIBS=$ac_check_lib_save_LIBS])
+AS_IF([test AS_VAR_GET(ac_Lib) = yes],
+      [m4_default([$3], [AC_DEFINE_UNQUOTED(AS_TR_CPP(HAVE_LIB$1))
+  LIBS="-l$1 $LIBS"
+])],
+      [$4])dnl
+AS_VAR_POPDEF([ac_Lib])dnl
+])# AC_CHECK_LIB