Get the fix for this issue with installing fpm

https://github.com/jordansissel/fpm/pull/1494

# Conflicts:
#	build.psm1

build.psm1

@@ -1,3 +1,6 @@
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT License.
+
 # On Unix paths is separated by colon
 # On Windows paths is separated by semicolon
 $script:TestModulePathSeparator = [System.IO.Path]::PathSeparator
@@ -1614,9 +1617,14 @@ function Start-PSBootstrap {
             # Install [fpm](https://github.com/jordansissel/fpm) and [ronn](https://github.com/rtomayko/ronn)
             if ($Package) {
                 try {
-                    # We cannot guess if the user wants to run gem install as root
-                    Start-NativeExecution { gem install fpm -v 1.9.3 }
-                    Start-NativeExecution { gem install ronn -v 0.7.3 }
+                    # We cannot guess if the user wants to run gem install as root on linux and windows,
+                    # but macOs usually requires sudo
+                    $gemsudo = ''
+                    if($Environment.IsMacOS) {
+                        $gemsudo = $sudo
+                    }
+                    Start-NativeExecution ([ScriptBlock]::Create("$gemsudo gem install fpm -v 1.10.0"))
+                    Start-NativeExecution ([ScriptBlock]::Create("$gemsudo gem install ronn -v 0.7.3"))
                 } catch {
                     Write-Warning "Installation of fpm and ronn gems failed! Must resolve manually."
                 }