Some comments and stuff.

lib/build.js

@@ -40,9 +40,10 @@ function build (gyp, argv, callback) {
     if (win) {
       argv.push('/p:Configuration=' + config)
     } else {
+      argv.push('BUILDTYPE=' + config)
+      // Don't overwrite an existing Makefile
       argv.push('-f');
       argv.push('Makefile.gyp');
-      argv.push('BUILDTYPE=' + config)
     }
 
     if (win && !hasSln) {

lib/configure.js

@@ -47,9 +47,10 @@ function configure (gyp, argv, callback) {
         argv.push(path.join(devDir, 'tools', 'patch.gypi'))
       }
     } else {
-      // Force the 'make' target for non-Windows
+      // use a 'gyp' suffix on the Makefile, as to not overwrite an existing one
       argv.unshift('.gyp')
       argv.unshift('--suffix')
+      // force the 'make' target for non-Windows
       argv.unshift('make')
       argv.unshift('-f')
     }

lib/copy.js

@@ -8,6 +8,8 @@ exports.usage = 'Copies a compiled bindings to an appropriate dir for runtime de
  */
 
 var fs = require('fs')
+  , path = require('path')
+  , mkdir = require('mkdirp')
 
 function copy (gyp, argv, callback) {
   callback(new Error('TODO: implement me'))