Setting env variable to newline char?

How can I set an environment variable to the newline character in
normal bourne shell?

I want to set the $IFS variable to only be the newline character,
because I am trying to run a for loop against a file, line by line,
but the lines have spaces so the default value of $IFS messes me up -
I want it to split by lines.

i.e. for line in $(cat myfile.txt)

Any help appreciated, thanks!

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