Can't find cywinb19.dll when executing program

[Gordon NEal]

I am new to cygwin so I'll apologize up front.
I am trying to self-host to get started and
when i execute $GCC_EXEC_PREFIX/cpp I get a 
win98 window that says it can't find 
cygwinb19.dll. If I echo $PATH is /bin:/usr/bin.
Is this something to do with windows environment?
Thanks in advance.

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