编译的时候输入make后出现这个这个错误，怎么解决啊！！！
[src/master]
gcc -Wmissing-prototypes -Wformat -DHAS_MYSQL -I/usr/local/mysql/include/mysql -DUSE_SASL_AUTH -DUSE_CYRUS_SASL -I/usr/include/sasl -g -O -I. -I../../include -DLINUX2 -o master master.o master_conf.o master_ent.o master_sig.o master_avail.o master_spawn.o master_service.o master_status.o master_listen.o master_vars.o master_wakeup.o master_flow.o ../../lib/libglobal.a ../../lib/libutil.a -L/usr/local/mysql/lib/mysql -lmysqlclient -lz -lm -l/usr/lib/sasl2 -lsasl2 -ldb -lnsl -lresolv
/usr/bin/ld: cannot find -l/usr/lib/sasl2
collect2: ld 返回 1
make: *** [master] 错误 1
make: *** [update] 错误 1
