Sudo giving dyld problem. Help for a beginner

I am new to using a macbook terminal. Initially when I used the terminal for working on Raspberry Pi everything was great. But now when I try to use the terminal and type sudo it keeps giving a dyld message. And also rejects my commands. The message is :

dyld: DYLD_ environment variables being ignored because main executable (/usr/bin/sudo) is setuid or setgid

Password:

what do I do? And why has this message started appearing all of a sudden? Can anyone give a step by step guide on stopping this Thanks a lot:)