Point the Podfile to a "generated" local podspec

src/objective-c/examples/Sample/Podfile

@@ -2,7 +2,7 @@ source 'https://github.com/CocoaPods/Specs.git'
 platform :ios, '8.0'
 
 pod 'gRPC', :path => "../../../.."
-pod 'ProtocolBuffers', '~> 1.9'
+pod 'Route_guide', :path => "protos"
 
 link_with 'Sample', 'SampleTests'
 

src/objective-c/examples/Sample/protos/Route_guide.podspec

+Pod::Spec.new do |s|
+  s.name     = 'Route_guide'
+  s.version  = '0.0.1'
+  s.summary  = 'Protobuf library generated from route_guide.proto'
+  s.homepage = 'https://github.com/grpc/grpc/tree/master/src/objective-c/examples/Sample/protos'
+  s.license  = 'New BSD'
+  s.authors  = { 'Jorge Canizales' => 'jcanizales@google.com' }
+
+  s.source_files = './*.{h,m}'
+
+  s.platform = :ios
+  s.ios.deployment_target = '6.0'
+  s.requires_arc = true
+
+  s.dependency 'ProtocolBuffers', '~> 1.9'
+end