Make Error.

[qxzhou1010]

I do all the steps by README, but the error still occurs.
After I do the make, the following errors occurs.

/bin/sh: pkg-config: command not found
/bin/sh: pkg-config: command not found
clang: error: no such file or directory: 'src/pk-based/*.o'
clang: error: no such file or directory: 'src/ot-based/*.o'
clang: error: no such file or directory: 'src/naive-hashing/*.o'
clang: error: no such file or directory: 'src/server-aided/*.o'
clang: error: no such file or directory: 'src/util/*.o'
clang: error: no such file or directory: 'src/hashing/*.o'
clang: error: no such file or directory: 'src/util/crypto/*.o'
clang: error: no such file or directory: 'src/util/ot/*.o'
clang: error: no such file or directory: 'src/externals/miracl_lib/*.o'

Please help me. My machine is macos.