Bdiff -up mtpaint-3.31/configure~ mtpaint-3.31/configure
--- mtpaint-3.31/configure~	2009-04-15 20:46:26.000000000 +0200
+++ mtpaint-3.31/configure	2010-02-11 21:16:43.996238223 +0100
@@ -460,7 +460,7 @@ else
 			fi
 		else
 			GTK_INCLUDE=`pkg-config gtk+-2.0 --cflags`
-			GTK_LIB=`pkg-config gtk+-2.0 --libs`
+			GTK_LIB="`pkg-config gtk+-2.0 --libs` -lX11 -lm"
 		fi
 	else
 		BIN_INSTALL=$WIN_BIN_INSTALL