書中base64範例問題

[Mysteriouskk]

我正照著書中的範例做練習，到安裝完mbedtls要做base64示例，在make指令發生錯誤，下面是錯誤代碼

Consolidate compiler generated dependencies of target base64
[ 50%] Linking C executable base64
/usr/bin/ld: CMakeFiles/base64.dir/base64.c.o: in function `main':
base64.c:(.text+0xed): undefined reference to `mbedtls_base64_encode'
/usr/bin/ld: base64.c:(.text+0x137): undefined reference to `mbedtls_base64_decode'
collect2: error: ld returned 1 exit status
make[2]: *** [CMakeFiles/base64.dir/build.make:97: base64] Error 1
make[1]: *** [CMakeFiles/Makefile2:83: CMakeFiles/base64.dir/all] Error 2
make: *** [Makefile:91: all] Error 2

想請問我有少安裝到什麼套件嗎，謝謝!