fix build on Linux

jabberd/jabberd.spec

@@ -105,6 +105,7 @@ AutoReqProv:  no
     export LDFLAGS="%{l_ldflags pth}"
     export LIBS=""
     case "%{l_platform -t}" in
+        *-linux* ) LIBS="$LIBS -ldl"                ;;
         *-sunos* ) LIBS="$LIBS -lsocket -lnsl -lrt" ;;
     esac
     export JHOME=%{l_prefix}/var/jabberd