Here's my configuration for how to install go-oci8 on a 64-bit Windows.
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Download and install 64-bit gcc compiler: http://tdm-gcc.tdragon.net/
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Download Oracle Instant Client and SDK: https://www.oracle.com/technetwork/database/database-technologies/instant-client/downloads/index.html
- Basic Package
- SDK Package
and unzip in a directory without spaces like C:\Oracle\instantclient_19_3