diff --git a/Cross-Platform-Vision.md b/Cross-Platform-Vision.md
index de3c39c..82ae740 100644
--- a/Cross-Platform-Vision.md
+++ b/Cross-Platform-Vision.md
@@ -41,10 +41,23 @@ Possible ways:
 * Ubuntu 18.10
 * Monodevelop 7.7 (build 1869) -> https://www.monodevelop.com/download/
 
+#### build gtk-sharp 2.12
+
+* Source: https://github.com/mono/gtk-sharp
+```
+git checkout https://github.com/mono/gtk-sharp
+cd gtk-sharp
+git checkout gtk-sharp-2-12-branch
+./bootstrap-2.12 --prefix=/opt/mono
+make
+make install
+```
+
 #### Special Mono Build (sides by side with the installed mono)
-* Source: https://github.com/borzel/mono
-* Instructions: https://www.mono-project.com/docs/compiling-mono/linux/
+
 * `PREFIX=/opt/mono` (depends on you)
+* source: https://github.com/borzel/mono
+* Instructions: https://www.mono-project.com/docs/compiling-mono/linux/
 
 ## Worklog