diff --git a/caca-php/config.m4 b/caca-php/config.m4
index 76826c5..eb3fd35 100644
--- a/caca-php/config.m4
+++ b/caca-php/config.m4
@@ -8,7 +8,7 @@ if test "$PHP_CACA" = "yes"; then
 		AC_MSG_ERROR(libcaca development files required !)
 	])
 
-	PHP_CHECK_LIBRARY(gd, gdImageSetPixel, [
+	AC_CHECK_LIB(gd, gdImageSetPixel, [
 		PHP_ADD_LIBRARY(gd,, CACA_SHARED_LIBADD)
 		AC_DEFINE(HAVE_GD, 1, [Wheter you have development files of gd])
 	])
diff --git a/caca-php/examples/dithering.php b/caca-php/examples/dithering.php
index 0e74ef9..a8fa76f 100755
--- a/caca-php/examples/dithering.php
+++ b/caca-php/examples/dithering.php
@@ -7,7 +7,7 @@ if (!$img)
 
 $dither = caca_create_dither($img);
 if (!$dither) 
-	die("Can not create dither. Maybe this image is not truecolor.\n");
+	die("Can not create dither. Maybe you compiled caca-php without gd support.\n");
 
 $canvas = caca_create_canvas(0, 0);
 $display = caca_create_display($canvas);