I tried to compile libjingle 0.4.o for Linux and found onet problems in /examples/call document:

make[1]: Entering directory `/home/dragon/workspace/googletalk/ libjingle-0.4.0' make[1]: Leaving directory `/home/dragon/workspace/googletalk/ libjingle-0.4.0' /bin/sh ../../../libtool --silent --tag=CXX --mode=link g++ -g -O2 - o call call-call_main.o call-callclient.o callconsole.o ../../../talk/ examples/login/libcricketexampleslogin.la ../../../talk/session/phone/ libcricketsessionphone.la ../../../talk/p2p/client/ libcricketp2pclient.la ../../../talk/p2p/base/ libcricketp2pbase.la ../../../talk/xmpp/libcricketxmpp.la ../../../ talk/xmllite/libcricketxmllite.la ../../../talk/base/libcricketbase.la -lexpat -lpthread -lssl -lcrypto -Wl,--export-dynamic -pthread - lgmodule-2.0 -ldl -lgthread-2.0 -lglib-2.0 /home/dragon/workspace/ googletalk/libjingle-0.4.0/talk/third_party/mediastreamer/ libmediastreamer.la -lasound /usr/bin/ld: cannot find -lasound collect2: ld returned 1 exit status make: *** [call] Error 1

/usr/bin/ld: cannot find -lasound ? what is the reason !

who can tell me ? help me ,please!