Only search for MSVC toolchain in Windows

src/Parser/ParserOptions.cs

@@ -5,6 +5,7 @@ using System.Globalization;
 using System.IO;
 using System.Linq;
 using System.Reflection;
+using System.Runtime.InteropServices;
 using System.Text.RegularExpressions;
 using LanguageVersion = CppSharp.Parser.LanguageVersion;
 
@@ -149,10 +150,13 @@ namespace CppSharp.Parser
 
                 AddSystemIncludeDirs(BuiltinsDir);
 
+                if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
+                {
                     vsVersion = MSVCToolchain.FindVSVersion(vsVersion);
                     foreach (var include in MSVCToolchain.GetSystemIncludes(vsVersion))
                         AddSystemIncludeDirs(include);
                 }
+            }
 
             // do not remove the CppSharp prefix becase the Mono C# compiler breaks
             if (!LanguageVersion.HasValue)