diff --git a/.gitignore b/.gitignore
index 7b63aaf..f1c7263 100644
--- a/.gitignore
+++ b/.gitignore
@@ -35,6 +35,7 @@
 src/cmd/gc/opnames.h
 src/cmd/gc/y.output
 src/cmd/go/zdefaultcc.go
+src/cmd/internal/obj/zbootstrap.go
 src/go/doc/headscan
 src/runtime/mkversion
 src/runtime/zaexperiment.h
diff --git a/src/cmd/dist/buildruntime.go b/src/cmd/dist/buildruntime.go
index 1e6ae82..5e26059 100644
--- a/src/cmd/dist/buildruntime.go
+++ b/src/cmd/dist/buildruntime.go
@@ -45,3 +45,31 @@
 
 	writefile(out, file, 0)
 }
+
+// mkzbootstrap writes cmd/internal/obj/zbootstrap.go:
+//
+//	package obj
+//
+//	const defaultGOROOT = <goroot>
+//	const defaultGOARM = <goarm>
+//	const defaultGOOS = <goos>
+//	const defaultGOARCH = <goarch>
+//	const version = <version>
+//	const goexperiment = <goexperiment>
+//
+func mkzbootstrap(file string) {
+	out := fmt.Sprintf(
+		"// auto generated by go tool dist\n"+
+			"\n"+
+			"package obj\n"+
+			"\n"+
+			"const defaultGOROOT = `%s`\n"+
+			"const defaultGOARM = `%s`\n"+
+			"const defaultGOOS = `%s`\n"+
+			"const defaultGOARCH = `%s`\n"+
+			"const version = `%s`\n"+
+			"const goexperiment = `%s`\n",
+		goroot_final, goarm, gohostos, gohostarch, goversion, os.Getenv("GOEXPERIMENT"))
+
+	writefile(out, file, 0)
+}
diff --git a/src/cmd/dist/buildtool.go b/src/cmd/dist/buildtool.go
index c493dd1..1037152 100644
--- a/src/cmd/dist/buildtool.go
+++ b/src/cmd/dist/buildtool.go
@@ -38,6 +38,8 @@
 	}
 	xprintf("##### Building Go toolchain using %s.\n", goroot_bootstrap)
 
+	mkzbootstrap(pathf("%s/src/cmd/internal/obj/zbootstrap.go", goroot))
+
 	// Use $GOROOT/pkg/bootstrap as the bootstrap workspace root.
 	// We use a subdirectory of $GOROOT/pkg because that's the
 	// space within $GOROOT where we store all generated objects.