go1.10构建失败，带有gcc-6参考

I have go1.10 installed via Homebrew (had the same issue installing the official golang.org package for macOS).

I'm failing to buid a fairly simple go program:

package main

import (
    "fmt"
    "net/http"
)

func main() {
    http.HandleFunc("/health", healthHandler)

    fmt.Println("Listening for connections")
    http.ListenAndServe("127.0.0.1:5000", nil)
}

func healthHandler(writer http.ResponseWriter, request *http.Request) {
    fmt.Fprint(writer, "Healthy!")
}

go build fails with:

# crypto/x509
fork/exec /usr/local/bin/gcc-6: no such file or directory

I don't have gcc-6 in my system (I have gcc-7 from both Xcode and Homebrew). Oddly, I can build the same code on a different mac (with same overall setup: go1.10, no gcc-6).

I've tried reinstalling the whole go/gcc combo through Homebrew but nothing seems to work. At this point I just feel lost.

Any ideas?