USE_OPENSSL_PC=openssl
LDFLAGS+=-ldl -Wl,-rpath,/opt/openssl/lib
+[jgh: I've see /usr/local/lib used]
+
The -ldl is needed by OpenSSL 1.0.2+ on Linux and is not needed on most
other platforms. The LDFLAGS is needed because `pkg-config` doesn't know
how to emit information about RPATH-stamping, but we can still leverage
readelf -d $(which exim) | grep RPATH
+[jgh: I've seen that spelled RUNPATH]
Very Advanced
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