Remove warning about installing globally if package is dep

lib/build.js

@@ -83,16 +83,41 @@ function linkStuff (pkg, folder, global, didRB, cb) {
   log.verbose("linkStuff", [global, gnm, gtop, parent])
   log.info("linkStuff", pkg._id)
 
-  if (top && pkg.preferGlobal && !global) {
-    log.warn("prefer global", pkg._id + " should be installed with -g")
-  }
+  shouldWarn(pkg, folder, global, function() {
+    asyncMap( [linkBins, linkMans, !didRB && rebuildBundles]
+            , function (fn, cb) {
+      if (!fn) return cb()
+      log.verbose(fn.name, pkg._id)
+      fn(pkg, folder, parent, gtop, cb)
+    }, cb)
+  })
+}
 
-  asyncMap( [linkBins, linkMans, !didRB && rebuildBundles]
-          , function (fn, cb) {
-    if (!fn) return cb()
-    log.verbose(fn.name, pkg._id)
-    fn(pkg, folder, parent, gtop, cb)
-  }, cb)
+function shouldWarn(pkg, folder, global, cb) {
+  var parent = path.dirname(folder)
+    , top = parent === npm.dir
+    , cwd = process.cwd()
+
+  readJson(path.resolve(cwd, "package.json"), function(er, topPkg) {
+    if (er) return cb(er)
+
+    var linkedPkg = path.basename(cwd)
+      , currentPkg = path.basename(folder)
+
+    // current searched package is the linked package on first call
+    if (linkedPkg !== currentPkg) {
+
+      // don't generate a warning if it's listed in dependencies
+      if (Object.keys(topPkg.dependencies).indexOf(currentPkg) === -1) {
+
+        if (top && pkg.preferGlobal && !global) {
+          log.warn("prefer global", pkg._id + " should be installed with -g")
+        }
+      }
+    }
+
+    cb()
+  })
 }
 
 function rebuildBundles (pkg, folder, parent, gtop, cb) {