docs: errors/build

Signed-off-by: Carlos A Becker <caarlos0@users.noreply.github.com>

www/docs/errors/build.md

@@ -0,0 +1,25 @@
+# Build Errors
+
+## Undefined methods
+
+If you see an error that looks like this:
+
+```shell
+  ⨯ release failed after 14s                 error=failed to build for darwin_amd64_v1: exit status 2: # github.com/rjeczalik/notify
+../../../../go/pkg/mod/github.com/rjeczalik/notify@v0.9.2/watcher_fsevents.go:49:11: undefined: stream
+../../../../go/pkg/mod/github.com/rjeczalik/notify@v0.9.2/watcher_fsevents.go:200:13: undefined: newStream
+```
+
+It usually means that some dependency you are using needs CGO, or does not have
+an implementation for the given OS.
+
+You can check that locally with:
+
+```bash
+GOOS=darwin GOARCH=amd64 go build ./...
+CGO_ENABLED=1 GOOS=darwin GOARCH=amd64 go build ./...
+```
+
+If the first fails, but the seconds succeeds, you need to set up
+[CGO](/limitations/cgo). If both fail, your dependency don't have an
+implementation for some methods for Darwin amd64 (in this example).

www/mkdocs.yml

@@ -151,6 +151,7 @@ nav:
   - errors/release-upload.md
   - errors/docker-build.md
   - errors/no-main.md
+  - errors/build.md
   - errors/resource-not-accessible-by-integration.md
   - errors/no-history.md
   - errors/multiple-binaries-archive.md