diff --git a/Lake/CLI.lean b/Lake/CLI.lean
index 0e3354fa6a..2695b6a4cf 100644
--- a/Lake/CLI.lean
+++ b/Lake/CLI.lean
@@ -3,6 +3,4 @@ Copyright (c) 2021 Mac Malone. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Mac Malone
 -/
-import Lake.CLI.Help
-import Lake.CLI.Init
 import Lake.CLI.Main
diff --git a/Lake/CLI/Build.lean b/Lake/CLI/Build.lean
new file mode 100644
index 0000000000..3ea5d3056a
--- /dev/null
+++ b/Lake/CLI/Build.lean
@@ -0,0 +1,77 @@
+/-
+Copyright (c) 2021 Mac Malone. All rights reserved.
+Released under Apache 2.0 license as described in the file LICENSE.
+Authors: Mac Malone
+-/
+import Lake.Build
+import Lake.Config.Util
+
+open Lean (Name)
+
+namespace Lake
+
+def resolvePkgSpec (rootPkg : Package) (spec : String) : IO Package := do
+  if spec.isEmpty then
+    return rootPkg
+  let pkgName := spec.toName
+  if pkgName == rootPkg.name then
+    return rootPkg
+  if let some dep := rootPkg.dependencies.find? (·.name == pkgName) then
+    LogMethodsT.run LogMethods.io <| resolveDep rootPkg dep
+  else
+    error s!"unknown package `{spec}`"
+
+def parseTargetBaseSpec (rootPkg : Package) (spec : String) : IO (Package × Option Name) := do
+  match spec.splitOn "/" with
+  | [pkgStr] =>
+    return (← resolvePkgSpec rootPkg pkgStr, none)
+  | [pkgStr, modStr] =>
+    let mod := modStr.toName
+    let pkg ← resolvePkgSpec rootPkg pkgStr
+    if pkg.hasModule mod then
+      return (pkg, mod)
+    else
+      error s!"package '{pkgStr}' has no module '{modStr}'"
+  | _ =>
+    error s!"invalid target spec '{spec}' (too many '/')"
+
+def parseTargetSpec (rootPkg : Package) (spec : String) : IO (Package × OpaqueTarget) := do
+  match spec.splitOn ":" with
+  | [rootSpec] =>
+    let (pkg, mod?) ← parseTargetBaseSpec rootPkg rootSpec
+    if let some mod := mod? then
+      return (pkg, pkg.moduleOleanTarget mod |>.withoutInfo)
+    else
+      return (pkg, pkg.defaultTarget)
+  | [rootSpec, facet] =>
+    let (pkg, mod?) ← parseTargetBaseSpec rootPkg rootSpec
+    if let some mod := mod? then
+      if facet == "olean" then
+        return (pkg, pkg.moduleOleanTarget mod |>.withoutInfo)
+      else if facet == "c" then
+        return (pkg, pkg.moduleOleanAndCTarget mod |>.withoutInfo)
+      else if facet == "o" then
+        return (pkg, pkg.moduleOTarget mod |>.withoutInfo)
+      else
+        error s!"unknown module facet '{facet}'"
+    else
+      if facet == "bin" then
+        return (pkg, pkg.binTarget.withoutInfo)
+      else if facet == "staticLib" then
+        return (pkg, pkg.staticLibTarget.withoutInfo)
+      else if facet == "sharedLib" then
+        return (pkg, pkg.sharedLibTarget.withoutInfo)
+      else if facet == "oleans" then
+        return (pkg, pkg.oleanTarget.withoutInfo)
+      else
+        error s!"unknown package facet '{facet}'"
+  | _ =>
+    error s!"invalid target spec '{spec}' (too many ':')"
+
+def build (targetSpecs : List String) : BuildM PUnit := do
+  let pkg ← getPackage
+  let targets ← liftM <| targetSpecs.mapM (parseTargetSpec pkg)
+  if targets.isEmpty then
+    pkg.defaultTarget.build
+  else
+    targets.forM fun (pkg, t) => adaptPackage pkg <| t.build
diff --git a/Lake/CLI/Main.lean b/Lake/CLI/Main.lean
index 391708c00d..2be28176ec 100644
--- a/Lake/CLI/Main.lean
+++ b/Lake/CLI/Main.lean
@@ -4,41 +4,22 @@ Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Mac Malone
 -/
 import Lean.Util.Paths
-import Lake.Util.Error
 import Lake.Config.Load
 import Lake.Config.SearchPath
 import Lake.Config.InstallPath
+import Lake.Config.Util
+import Lake.Util.Error
 import Lake.Util.MainM
 import Lake.Util.CliT
 import Lake.CLI.Init
 import Lake.CLI.Help
-import Lake.Build
+import Lake.CLI.Build
 
 open System
 open Lean (Name LeanPaths Json toJson)
 
 namespace Lake
 
--- # Utilities
-
-def Package.run (script : String) (args : List String) (self : Package) : IO UInt32 :=
-  if let some script := self.scripts.find? script then
-    script.run args
-  else do
-    throw <| IO.userError s!"unknown script {script}"
-
-def Package.clean (self : Package) : IO PUnit := do
-  if (← self.buildDir.pathExists) then
-    IO.FS.removeDirAll self.buildDir
-
-open PackageFacet in
-def Package.defaultTarget (self : Package) : OpaqueTarget :=
-  match self.defaultFacet with
-  | bin => self.binTarget.withoutInfo
-  | staticLib => self.staticLibTarget.withoutInfo
-  | sharedLib => self.sharedLibTarget.withoutInfo
-  | oleans =>  self.oleanTarget.withoutInfo
-
 -- # CLI
 
 structure CliState where
@@ -251,72 +232,6 @@ def printPaths (imports : List String := []) : CliM PUnit := do
   else
     exit noConfigFileCode
 
-def resolvePkgSpec (rootPkg : Package) (spec : String) : IO Package := do
-  if spec.isEmpty then
-    return rootPkg
-  let pkgName := spec.toName
-  if pkgName == rootPkg.name then
-    return rootPkg
-  if let some dep := rootPkg.dependencies.find? (·.name == pkgName) then
-    LogMethodsT.run LogMethods.io <| resolveDep rootPkg dep
-  else
-    error s!"unknown package `{spec}`"
-
-def parseTargetBaseSpec (rootPkg : Package) (spec : String) : IO (Package × Option Name) := do
-  match spec.splitOn "/" with
-  | [pkgStr] =>
-    return (← resolvePkgSpec rootPkg pkgStr, none)
-  | [pkgStr, modStr] =>
-    let mod := modStr.toName
-    let pkg ← resolvePkgSpec rootPkg pkgStr
-    if pkg.hasModule mod then
-      return (pkg, mod)
-    else
-      error s!"package '{pkgStr}' has no module '{modStr}'"
-  | _ =>
-    error s!"invalid target spec '{spec}' (too many '/')"
-
-def parseTargetSpec (rootPkg : Package) (spec : String) : IO (Package × OpaqueTarget) := do
-  match spec.splitOn ":" with
-  | [rootSpec] =>
-    let (pkg, mod?) ← parseTargetBaseSpec rootPkg rootSpec
-    if let some mod := mod? then
-      return (pkg, pkg.moduleOleanTarget mod |>.withoutInfo)
-    else
-      return (pkg, pkg.defaultTarget)
-  | [rootSpec, facet] =>
-    let (pkg, mod?) ← parseTargetBaseSpec rootPkg rootSpec
-    if let some mod := mod? then
-      if facet == "olean" then
-        return (pkg, pkg.moduleOleanTarget mod |>.withoutInfo)
-      else if facet == "c" then
-        return (pkg, pkg.moduleOleanAndCTarget mod |>.withoutInfo)
-      else if facet == "o" then
-        return (pkg, pkg.moduleOTarget mod |>.withoutInfo)
-      else
-        error s!"unknown module facet '{facet}'"
-    else
-      if facet == "bin" then
-        return (pkg, pkg.binTarget.withoutInfo)
-      else if facet == "staticLib" then
-        return (pkg, pkg.staticLibTarget.withoutInfo)
-      else if facet == "sharedLib" then
-        return (pkg, pkg.sharedLibTarget.withoutInfo)
-      else if facet == "oleans" then
-        return (pkg, pkg.oleanTarget.withoutInfo)
-      else
-        error s!"unknown package facet '{facet}'"
-  | _ =>
-    error s!"invalid target spec '{spec}' (too many ':')"
-
-def build (targetSpecs : List String) : BuildM PUnit := do
-  let pkg ← getPackage
-  let targets ← liftM <| targetSpecs.mapM (parseTargetSpec pkg)
-  if targets.isEmpty then
-    pkg.defaultTarget.build
-  else
-    targets.forM fun (pkg, t) => adaptPackage pkg <| t.build
-
 def server (leanInstall : LeanInstall) (pkg : Package) (args : List String) : CliM PUnit := do
   let child ← IO.Process.spawn {
     cmd := leanInstall.lean.toString,
diff --git a/Lake/Config.lean b/Lake/Config.lean
index c8149c8fb5..b59632f980 100644
--- a/Lake/Config.lean
+++ b/Lake/Config.lean
@@ -11,3 +11,4 @@ import Lake.Config.Package
 import Lake.Config.SearchPath
 import Lake.Config.Resolve
 import Lake.Config.Load
+import Lake.Config.Util
diff --git a/Lake/Config/Util.lean b/Lake/Config/Util.lean
new file mode 100644
index 0000000000..e7700d5be7
--- /dev/null
+++ b/Lake/Config/Util.lean
@@ -0,0 +1,26 @@
+/-
+Copyright (c) 2021 Mac Malone. All rights reserved.
+Released under Apache 2.0 license as described in the file LICENSE.
+Authors: Mac Malone
+-/
+import Lake.Build
+
+namespace Lake
+
+def Package.run (script : String) (args : List String) (self : Package) : IO UInt32 :=
+  if let some script := self.scripts.find? script then
+    script.run args
+  else do
+    throw <| IO.userError s!"unknown script {script}"
+
+def Package.clean (self : Package) : IO PUnit := do
+  if (← self.buildDir.pathExists) then
+    IO.FS.removeDirAll self.buildDir
+
+open PackageFacet in
+def Package.defaultTarget (self : Package) : OpaqueTarget :=
+  match self.defaultFacet with
+  | bin => self.binTarget.withoutInfo
+  | staticLib => self.staticLibTarget.withoutInfo
+  | sharedLib => self.sharedLibTarget.withoutInfo
+  | oleans =>  self.oleanTarget.withoutInfo