check for libz; refs #2

configure.in

@@ -191,14 +191,20 @@ if test "$have_stacktrace" = "yes"; then
    If you are not a developer, you perhaps don't need it...?])])
   if test "$have_dynamicstack" != "yes"; then
     AC_DEFINE([NO_LTDL])
+    AC_SEARCH_LIBS(compress, z,
+                   [AC_MSG_RESULT([OK, found libz])],
+[AC_MSG_ERROR([zlib not found!
+It is required for stack trace!
+ - install zlib development package
+ - or configure with option --enable-ltdl
+ - or configure with option --disable-stacktrace])])
     AC_SEARCH_LIBS(bfd_openr, bfd,
                    [AC_MSG_RESULT([OK, found libbfd])],
 [AC_MSG_ERROR([BFD library from the binutils package not found!
 It is required for stack trace!
  - install binutils or binutils-devel
  - or configure with option --enable-ltdl
- - or configure with option --disable-stacktrace])],
+ - or configure with option --disable-stacktrace])])
-                   -lz -ldl)
   fi
   # bug {
   ac_includes_default=$old_ac_includes_default