刚看了一眼我维护的一个包 mime，发现 CRAN 检查结果中有一个 NOTE：
Check Details
Version: 0.5
Check: compiled code
Result: NOTE
File ‘mime/libs/mime.so’:
Found no calls to: ‘R_registerRoutines’, ‘R_useDynamicSymbols’
It is good practice to register native routines and to disable symbol
search.
See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual.
本人属于 C 无能君。求懂行的人帮忙修补一下；我在 Github 上等：https://github.com/yihui/mime
