diff --git a/Makefile b/Makefile
index 1e90165..ef3bbf9 100644
--- a/Makefile
+++ b/Makefile
@@ -10,8 +10,9 @@ DEBUG_CFLAGS = -g # -pg
 OPTIM = 2
 
 # GTK
-GTK_CFLAGS = $(shell pkg-config --cflags gtk+-2.0) -DGTK_DISABLE_SINGLE_INCLUDES -DGSEAL_ENABLE
-GTK_LDLIBS = $(shell pkg-config --libs gtk+-2.0) -lz -lm
+GTK_VERSION = "+-2.0"
+GTK_CFLAGS = $(shell pkg-config --cflags gtk$(GTK_VERSION)) -DGTK_DISABLE_SINGLE_INCLUDES -DGSEAL_ENABLE
+GTK_LDLIBS = $(shell pkg-config --libs gtk$(GTK_VERSION)) -lz -lm
 
 # Embedded qemu
 QEMU_DIR = src/qemu-git