--- a/configure.ac
+++ b/configure.ac
@@ -29,7 +29,7 @@
             [Force GTK2 GUI, even if GTK3 is available @<:@default=check@:>@])],
             [], [with_gtk2=no])
 
-if [ test "x$with_gtk2" == xno ]; then
+if [ test "x$with_gtk2" = xno ]; then
     PKG_CHECK_MODULES([GTK],[gtk+-3.0],foundgtk3=true,foundgtk3=false)
 else
     echo "Using GTK2..."
@@ -37,18 +37,13 @@
 fi
 
 if [ $foundgtk3 ]; then
-	XSENSORS_CFLAGS="`pkg-config --cflags gtk+-3.0` -Werror -Wall"
-	XSENSORS_LIBS="`pkg-config --libs gtk+-3.0`"
+	XSENSORS_CFLAGS="`${PKG_CONFIG} --cflags gtk+-3.0` -Wall -Wall"
+	XSENSORS_LIBS="`${PKG_CONFIG} --libs gtk+-3.0`"
 else
-    if [ test "x$with_gtk2" == xno ]; then
-        echo "GTK3 is not installed, checking for GTK2 instead..."
-    fi
-	AM_PATH_GTK_2_0(2.8.0,,AC_MSG_ERROR([
+    AC_MSG_ERROR([
 *** GTK+ is required to build xsensors; please make sure you have the GTK+
 *** development headers installed. The latest version of GTK+ is
-*** always available at http://www.gtk.org/.]))
-	XSENSORS_CFLAGS="`pkg-config --cflags gtk+-2.0` -Werror -Wall"
-	XSENSORS_LIBS="`pkg-config --libs gtk+-2.0`"
+*** always available at http://www.gtk.org/.])
 fi
 
 AC_SUBST(XSENSORS_CFLAGS)