PROJ
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PROJ 7.0.0 static library
7.0.0 now depends on libcurl, and thus requires explicitly passing a -DCURL_STATICLIB directive to ./configure in order to build an usable PROJ static library (due to name mangling issues of link symbols).
tested on Windows/MinGW, but the same will probably happen on Linux too.
You need to set ENABLE_CURL=OFF as well as BUILD_PROJSYNC=OFF since it depends on the CURL library and you should be good to go.
SEE BUILD OPTIONS