BES now includes DMR++; hack the configure script WRT libcurl

Description

The DMR++ code is built when --enable-developer is used with configure. When that is the case, require a modern libcurl. Also update the INSTALL and docs.opendap.org notes.

This is an open issue on github: https://github.com/OPENDAP/bes/issues/93

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Assignee

James Gallagher

Reporter

James Gallagher

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Priority

High
Configure