Hello,

__ctype_tolower and __ctype_b are c library functions, which may be related to your compilation environment.

Check whether this error will occur when compiling rknpu2 directly. If an error is reported, please check your compilation environment:

1. Install rknpu2

git clone https ...

//opt/RKNN/rknpu2/runtime/RV1106/Linux/librknn_api/lib/librknnmrt.so: undefined reference to `__ctype_tolower'
//opt/RKNN/rknpu2/runtime/RV1106/Linux/librknn_api/lib/librknnmrt.so: undefined reference to `__ctype_b'

在给 luckfoxpico pro交叉编译mmdeploy在link demo的时候提示undefined reference to `__ctype_b'
I ...