gdal 3.1 wants PROJ 6 symbols but my PROJ version is 7

I'm trying to build gdal3.1 on my mac because brew only has version 2.4.4.6. I have PROJ 7.0.1 on my mac. When I run ./configure for gdal 3.1 it ends with the error: PROJ 6 symbols not found. What is needed to fix this?

Solution

I solved this problem by finding an old version of gcc from 2013. When I renamed that to gccOld, the ./configure process ran to completion. make still doesn't work but that's going to be a separate question.

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