Merge pull request #602 from Nihlus/unix-unofficial-xamarin-android

Support building OpenTK.Android on Linux

src/OpenTK/Minimal.cs

@@ -1,6 +1,10 @@
 #if ANDROID || IPHONE || MINIMAL
 using System;
 
+#if !MINIMAL
+using System.Drawing;
+#endif
+
 namespace OpenTK
 {
     // Override a number of System.* classes when compiling for

src/OpenTK/OpenTK.Android.csproj

@@ -43,6 +43,12 @@
     <DocumentationFile>bin\Release\Android\OpenTK.xml</DocumentationFile>
     <DebugType>pdbonly</DebugType>
   </PropertyGroup>
+  <PropertyGroup Condition=" '$(OS)' == 'Unix' ">
+    <MonoAndroidToolsDirectory>/usr/lib/mono/mandroid</MonoAndroidToolsDirectory>
+    <MonoAndroidBinDirectory>/usr/lib/mono/xamarin-android/bin</MonoAndroidBinDirectory>
+    <AndroidSdkDirectory>$(ANDROID_SDK_PATH)</AndroidSdkDirectory>
+    <AndroidNdkDirectory>$(ANDROID_NDK_PATH)</AndroidNdkDirectory>
+  </PropertyGroup>
   <ItemGroup>
     <Reference Include="System.Xml" />
     <Reference Include="Mono.Android" />