check for libtool

configure.in

@@ -12,8 +12,8 @@
 # init
 AC_INIT([mrw/mrw.hpp.in])
 PACKAGENAME=mrw-c++
-m4_define(x_major, 1)
-m4_define(x_minor, 9)
+m4_define(x_major, 2)
+m4_define(x_minor, 0)
 m4_define(x_least, 0)
 AM_INIT_AUTOMAKE(@PACKAGENAME@, @MAJOR@.@MINOR@.@LEAST@, [marc@waeckerlin.org])
 
@@ -56,6 +56,7 @@ AC_CHECK_HEADER(sys/old_procfs.h, [AM_CPPFLAGS=-D__solaris__])
 
 # libraries
 AC_CHECK_HEADER(log4cxx/logger.h, [have_log4cxx=yes])
+AC_CHECK_HEADER(ltdl.h, [have_ltdl=yes])
 
 # Arguments
 AM_MAINTAINER_MODE
@@ -87,11 +88,16 @@ AC_ARG_ENABLE(log4cxx,
                           stack trace],
   [have_log4cxx="$enableval"])
 AM_CONDITIONAL(HAVE_LOG4CXX, test "$have_log4cxx" = "yes")
+AC_ARG_ENABLE(ltdl,
+  [  --disable-ltdl          disable use of libtool library dynamic loading
+                          Note: For automated stack trace, you need ltdl],
+  [have_ltdl="$enableval"])
+AM_CONDITIONAL(HAVE_LTDL, test "$have_ltdl" = "yes")
 AC_ARG_ENABLE(stacktrace,
   [  --disable-stacktrace    disable stack trace, use this if you cannot
                           compile the library on your system otherwise and
                           you still want to use the other parts],
-  [have_stacktrace="$enableval"], [have_stacktrace="yes"])
+  [have_stacktrace="$enableval"], [have_stacktrace=$have_ltdl])
 AM_CONDITIONAL(HAVE_STACKTRACE, test "$have_stacktrace" = "yes")
 if test "$have_stacktrace" = "yes"; then
   AC_SEARCH_LIBS(cplus_demangle, [demangle iberty],
@@ -140,3 +146,8 @@ AC_MSG_WARN([Library log4cxx will not be used!
     http://logging.apache.org/log4cxx]); fi
 if test "$have_stacktrace" != "yes"; then
 AC_MSG_WARN([mrw::StackTrace is disabled!]); fi
+if test "$have_ltdl" != "yes"; then
+AC_MSG_ERROR([mrw::DynamicLibrary dynamic library loading is disabled!
+ - mrw::StackTrace is disabled without mrw::DynamicLibrary
+ - install the GNU libtool, if you need mrw::DynamicLibrary]);
+fi