error $GOPATH: no library found in $GOPATH: rdkafka
安裝confluent-kafka-go出錯時，請使用brew安裝pkg-config，手動go get安裝的pkg-config還不行。。。
錯誤提示：
go get -u github.com/confluentinc/confluent-kafka-go/kafka # pkg-config --cflags -- rdkafka error $GOPATH: no library found in $GOPATH: rdkafka error github.com: PKG_CONDIF_GITHUB not exported, skipping github.com lookup error $PKG_CONFIG_PATH: open rdkafka.pc: no such file or directory error <autogenerated>: no library found in $GOPATH: rdkafka pkg-config: exit status 1
解決：
brew install pkg-config
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