From e20d96ea4eab7fc931cf8c82c1a6163b8ef257d8 Mon Sep 17 00:00:00 2001
From: Peter Johnson <johnson.peter@gmail.com>
Date: Sat, 7 Dec 2019 21:39:58 -0800
Subject: [PATCH] Use __has_include for WPILib.h (#2164)

Now that commands and cameraserver libraries are no longer direct dependencies,
it's necessary to check for their presence.
---
 wpilibc/src/main/native/include/frc/WPILib.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/wpilibc/src/main/native/include/frc/WPILib.h b/wpilibc/src/main/native/include/frc/WPILib.h
index d9445002b3..9d62514e18 100644
--- a/wpilibc/src/main/native/include/frc/WPILib.h
+++ b/wpilibc/src/main/native/include/frc/WPILib.h
@@ -16,8 +16,10 @@
 
 // clang-format on
 
+#if __has_include(<cameraserver/CameraServer.h>)
 #include <cameraserver/CameraServer.h>
 #include <vision/VisionRunner.h>
+#endif
 
 #include "frc/ADXL345_I2C.h"
 #include "frc/ADXL345_SPI.h"
@@ -82,6 +84,7 @@
 #include "frc/VictorSP.h"
 #include "frc/WPIErrors.h"
 #include "frc/XboxController.h"
+#if __has_include("frc/buttons/InternalButton.h")
 #include "frc/buttons/InternalButton.h"
 #include "frc/buttons/JoystickButton.h"
 #include "frc/buttons/NetworkButton.h"
@@ -95,6 +98,7 @@
 #include "frc/commands/WaitCommand.h"
 #include "frc/commands/WaitForChildren.h"
 #include "frc/commands/WaitUntilCommand.h"
+#endif
 #include "frc/drive/DifferentialDrive.h"
 #include "frc/drive/KilloughDrive.h"
 #include "frc/drive/MecanumDrive.h"