改了一下代码，make时出这样的错误，怎么解决呢？

make -s  all-recursive
Making all in libsystem
Making all in libBBS
Making all in rzsz
Making all in src
  [Linking bbsd]
/usr/bin/ld: cannot find -lssl
collect2: ld returned 1 exit status
make[2]: *** [bbsd] Error 1
make[1]: *** [all-recursive] Error 1
make: *** [all] Error 2
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