proj_api.h not found in standard or given locations

Question

[xiaoguang]

When I install R package "sf", I always meet this error:

configure: error: proj_api.h not found in standard or given locations."

Actually, I have "proj_api.h" in my miniconda3 includ dir and "proj_api.so"in lib dir, but it continue give me an error?

[ATpoint]

I do not know if it helps in your case but explicitely setting the following three paths in ~/.bashrc helped me getting rid of these kinds of errors:

export LDFLAGS="-L$HOME/pathto/anaconda3/lib"
export CFLAGS="-I$HOME/pathto/anaconda3/include"
export CPATH="$HOME/pathto/anaconda3/include"

[xiaoguang]

Thank you very much, I know what's wrong with me. I have not installed proj.4.