diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index b0f07fc8..83820463 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -73,10 +73,8 @@ jobs:
       - run: /opt/tea.xyz/var/pantry/scripts/sort.ts ${{ inputs.projects }}
         id: sorted
 
-      - run: cli/scripts/install.ts ${{ steps.sorted.outputs.pre-install }}
-
       # running out of /opt because only pantry.core has these scripts
-      - run: /opt/tea.xyz/var/pantry/scripts/build.plumbing.ts ${{ steps.sorted.outputs.pkgs }}
+      - run: /opt/tea.xyz/var/pantry/scripts/build.ts ${{ steps.sorted.outputs.pkgs }}
         id: build
         env:
           # GITHUB_TOKEN doesn't have private access to teaxyz/cli.
diff --git a/scripts/build.ts b/scripts/build.ts
index bb2e7d64..232c4f6c 100755
--- a/scripts/build.ts
+++ b/scripts/build.ts
@@ -1,6 +1,10 @@
 #!/usr/bin/env -S tea -E
 
 /*---
+dependencies:
+  gnu.org/tar: 1
+  tukaani.org/xz: 5
+  sourceware.org/bzip2: 1
 args:
   - deno
   - run
@@ -13,34 +17,43 @@ args:
   - --import-map={{ srcroot }}/import-map.json
 ---*/
 
-import { usePantry, useFlags, useCellar, useInventory } from "hooks"
+import { usePantry, useFlags, useCellar, useInventory, usePrefix } from "hooks"
 import { hydrate, install, link } from "prefab"
 import { str as pkgstr } from "utils/pkg.ts"
 import * as ARGV from "./utils/args.ts"
 import { panic } from "utils/error.ts"
-import build from "./build/build.ts"
+import build, { BuildResult } from "./build/build.ts"
+import { set_output } from "./utils/gha.ts";
 
 useFlags()
 
 const pantry = usePantry()
 const cellar = useCellar()
 const inventory = useInventory()
-const dry = await ARGV.toArray(ARGV.pkgs())
-const wet = await hydrate(dry, async (pkg, dry) => {
-  const deps = await pantry.getDeps(pkg)
-  return dry ? [...deps.build, ...deps.runtime] : deps.runtime
-})
+const raw = await ARGV.toArray(ARGV.pkgs())
 
-for (const pkg of wet.wet) {
-  if (!await cellar.has(pkg)) {
-    const version = await inventory.select(pkg) ?? panic(`${pkgstr(pkg)} not found`)
-    const installation = await install({ project: pkg.project, version })
-    await link(installation)
+const rv: BuildResult[] = []
+
+for (const rq of raw) {
+  const dry = await pantry.getDeps(rq)
+  const wet = await hydrate([...dry.runtime, ...dry.build])
+
+  for (const pkg of wet.pkgs) {
+    if (!await cellar.has(pkg)) {
+      const version = await inventory.select(pkg) ?? panic(`${pkgstr(pkg)} not found`)
+      const installation = await install({ project: pkg.project, version })
+      await link(installation)
+    }
   }
-}
 
-for (const rq of dry) {
   const pkg = await pantry.resolve(rq)
-  await build(pkg)
+  rv.push(await build(pkg))
   await link(pkg)
 }
+
+const to = usePrefix()
+await set_output("pkgs", rv.map(x => pkgstr(x.installation.pkg)))
+await set_output("paths", rv.map(x => x.installation.path), '%0A')
+await set_output("relative-paths", rv.map(x => x.installation.path.relative({ to })))
+await set_output("srcs", rv.map(x => x.src?.relative({ to }) ?? "~"))
+await set_output("srcs-relative-paths", rv.compact(x => x.src?.relative({ to })))
diff --git a/scripts/sort.ts b/scripts/sort.ts
index bec06617..56c41422 100755
--- a/scripts/sort.ts
+++ b/scripts/sort.ts
@@ -16,8 +16,8 @@ args:
 import { pkg } from "utils"
 import { usePantry, useFlags } from "hooks"
 import { hydrate } from "prefab"
-import { PackageRequirement } from "types"
 import * as ARGV from "./utils/args.ts"
+import { set_output } from "./utils/gha.ts";
 
 const flags = useFlags()
 const pantry = usePantry()
@@ -30,18 +30,9 @@ const wet = await hydrate(dry, async (pkg, dry) => {
 })
 
 if (Deno.env.get("GITHUB_ACTIONS")) {
-  const massage = (input: PackageRequirement[]) =>
-    input.map(p => {
-      let out = pkg.str(p)
-      // shell quoting via GHA is weird and we don’t fully understand it
-      if (/[<>]/.test(out)) out = `"${out}"`
-      return out
-    }).join(" ")
-
-  console.log(`::set-output name=pkgs::${massage(wet.dry)}`)
-  console.log(`::set-output name=pre-install::${massage(wet.wet)}`)
+  await set_output('pkgs', wet.dry.map(pkg.str))
 } else {
-  const gas = wet.dry.map(x => pkg.str(x))
+  const gas = wet.dry.map(pkg.str)
   if (flags.json) {
     console.log(gas)
   } else {