Added hint how to compile against gtk3 libs.

diff --git a/README.md b/README.md
index ca4d0d5..5f9dca5 100644 (file)
--- a/README.md
+++ b/README.md
@@ -57,6 +57,8 @@ root).
     make clean && make
     make install
 
+To build vimb against gtk3 you can use `make GTK=3`.
+
 # license
 Information about the license are found in the file LICENSE.