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diff --git a/configure.ac b/configure.ac
index 6778105..2cef444 100644
--- a/configure.ac
+++ b/configure.ac
@@ -265,7 +265,16 @@ if test "${enable_pam}" = "yes" ; then
 fi
 
 if test "${enable_gui}" = "yes"; then
-	PKG_CHECK_MODULES([GTK], [gtk+ >= 1.0],, AC_MSG_ERROR([Cannot locate gtk+]))
+	PKG_CHECK_MODULES(
+		[GTK],
+		[gtk+-2.0 >= 2.0],
+		,
+		PKG_CHECK_MODULES(
+			[GTK],
+			[gtk+ >= 1.0],,
+			AC_MSG_ERROR([Cannot locate gtk+])
+		)
+	)
 fi
 
 pkgconfigdir="\$(libdir)/pkgconfig"