Source: Gentoo
Reason: fix build with mono-4
Upstream: just a simple backport of a series of more complicated fixes

diff -Naur pinta-1.6_orig/Pinta/Pinta.csproj pinta-1.6/Pinta/Pinta.csproj
--- pinta-1.6_orig/Pinta/Pinta.csproj	2015-03-01 23:07:57.000000000 +0100
+++ pinta-1.6/Pinta/Pinta.csproj	2015-12-12 15:02:28.796155090 +0100
@@ -80,7 +80,7 @@
     <Reference Include="atk-sharp, Version=2.12.0.0, Culture=neutral, PublicKeyToken=35e10195dab3c99f">
       <Package>gtk-sharp-2.0</Package>
     </Reference>
-    <Reference Include="Mono.Posix, Version=2.0.0.0, Culture=neutral, PublicKeyToken=0738eb9f132ed756, processorArchitecture=MSIL" />
+    <Reference Include="Mono.Posix, Version=4.0.0.0, Culture=neutral, PublicKeyToken=0738eb9f132ed756, processorArchitecture=MSIL" />
     <Reference Include="System" />
     <Reference Include="gtk-sharp, Version=2.12.0.0, Culture=neutral, PublicKeyToken=35e10195dab3c99f">
       <Package>gtk-sharp-2.0</Package>
diff -Naur pinta-1.6_orig/Pinta.Core/Pinta.Core.csproj pinta-1.6/Pinta.Core/Pinta.Core.csproj
--- pinta-1.6_orig/Pinta.Core/Pinta.Core.csproj	2015-03-01 23:07:57.000000000 +0100
+++ pinta-1.6/Pinta.Core/Pinta.Core.csproj	2015-12-12 15:02:28.798155090 +0100
@@ -55,7 +55,7 @@
     <CodeAnalysisRuleSet>AllRules.ruleset</CodeAnalysisRuleSet>
   </PropertyGroup>
   <ItemGroup>
-    <Reference Include="Mono.Posix, Version=2.0.0.0, Culture=neutral, PublicKeyToken=0738eb9f132ed756, processorArchitecture=MSIL" />
+    <Reference Include="Mono.Posix, Version=4.0.0.0, Culture=neutral, PublicKeyToken=0738eb9f132ed756, processorArchitecture=MSIL" />
     <Reference Include="System" />
     <Reference Include="gtk-sharp, Version=2.12.0.0, Culture=neutral, PublicKeyToken=35e10195dab3c99f" />
     <Reference Include="System.Core" />
diff -Naur pinta-1.6_orig/Pinta.Effects/Pinta.Effects.csproj pinta-1.6/Pinta.Effects/Pinta.Effects.csproj
--- pinta-1.6_orig/Pinta.Effects/Pinta.Effects.csproj	2015-03-01 23:07:57.000000000 +0100
+++ pinta-1.6/Pinta.Effects/Pinta.Effects.csproj	2015-12-12 15:02:28.797155090 +0100
@@ -58,7 +58,7 @@
     <Reference Include="gdk-sharp, Version=2.12.0.0, Culture=neutral, PublicKeyToken=35e10195dab3c99f" />
     <Reference Include="glib-sharp, Version=2.12.0.0, Culture=neutral, PublicKeyToken=35e10195dab3c99f" />
     <Reference Include="gtk-sharp, Version=2.12.0.0, Culture=neutral, PublicKeyToken=35e10195dab3c99f" />
-    <Reference Include="Mono.Posix, Version=2.0.0.0, Culture=neutral, PublicKeyToken=0738eb9f132ed756, processorArchitecture=MSIL" />
+    <Reference Include="Mono.Posix, Version=4.0.0.0, Culture=neutral, PublicKeyToken=0738eb9f132ed756, processorArchitecture=MSIL" />
     <Reference Include="System" />
     <Reference Include="System.Core">
     </Reference>
diff -Naur pinta-1.6_orig/Pinta.Gui.Widgets/Pinta.Gui.Widgets.csproj pinta-1.6/Pinta.Gui.Widgets/Pinta.Gui.Widgets.csproj
--- pinta-1.6_orig/Pinta.Gui.Widgets/Pinta.Gui.Widgets.csproj	2015-03-01 23:07:57.000000000 +0100
+++ pinta-1.6/Pinta.Gui.Widgets/Pinta.Gui.Widgets.csproj	2015-12-12 15:02:28.797155090 +0100
@@ -54,7 +54,7 @@
     <CodeAnalysisRuleSet>AllRules.ruleset</CodeAnalysisRuleSet>
   </PropertyGroup>
   <ItemGroup>
-    <Reference Include="Mono.Posix, Version=2.0.0.0, Culture=neutral, PublicKeyToken=0738eb9f132ed756, processorArchitecture=MSIL" />
+    <Reference Include="Mono.Posix, Version=4.0.0.0, Culture=neutral, PublicKeyToken=0738eb9f132ed756, processorArchitecture=MSIL" />
     <Reference Include="System" />
     <Reference Include="gtk-sharp, Version=2.12.0.0, Culture=neutral, PublicKeyToken=35e10195dab3c99f" />
     <Reference Include="gdk-sharp, Version=2.12.0.0, Culture=neutral, PublicKeyToken=35e10195dab3c99f" />
diff -Naur pinta-1.6_orig/Pinta.Install.proj pinta-1.6/Pinta.Install.proj
--- pinta-1.6_orig/Pinta.Install.proj	2015-03-01 23:14:37.000000000 +0100
+++ pinta-1.6/Pinta.Install.proj	2015-12-12 15:05:20.974156635 +0100
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003" ToolsVersion="3.5">
+<Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003" ToolsVersion="4.0">
 
   <!-- Set some paths -->
   <PropertyGroup>
diff -Naur pinta-1.6_orig/Pinta.Tools/Pinta.Tools.csproj pinta-1.6/Pinta.Tools/Pinta.Tools.csproj
--- pinta-1.6_orig/Pinta.Tools/Pinta.Tools.csproj	2015-03-01 23:07:57.000000000 +0100
+++ pinta-1.6/Pinta.Tools/Pinta.Tools.csproj	2015-12-12 15:02:28.795155090 +0100
@@ -54,7 +54,7 @@
     <CodeAnalysisRuleSet>AllRules.ruleset</CodeAnalysisRuleSet>
   </PropertyGroup>
   <ItemGroup>
-    <Reference Include="Mono.Posix, Version=2.0.0.0, Culture=neutral, PublicKeyToken=0738eb9f132ed756, processorArchitecture=MSIL" />
+    <Reference Include="Mono.Posix, Version=4.0.0.0, Culture=neutral, PublicKeyToken=0738eb9f132ed756, processorArchitecture=MSIL" />
     <Reference Include="System" />
     <Reference Include="System.Core" />
     <Reference Include="System.Xml" />