I forgot those few lines :

diff --git a/configure.ac b/configure.ac
index 4e80eed..c99477a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2407,7 +2406,7 @@ if test "${HAVE_X11}" = "yes" || test "${HAVE_NS}" =
"yes" || test "${HAVE_W32}"
   if test "${with_imagemagick}" != "no"; then
     ## 6.3.5 is the earliest version known to work; see Bug#17339.
     ## 6.8.2 makes Emacs crash; see Bug#13867.
-    IMAGEMAGICK_MODULE="Wand >= 6.3.5 Wand != 6.8.2"
+    IMAGEMAGICK_MODULE="MagickWand >= 6.3.5 MagickWand != 6.8.2"
     EMACS_CHECK_MODULES([IMAGEMAGICK], [$IMAGEMAGICK_MODULE])
     AC_SUBST(IMAGEMAGICK_CFLAGS)
     AC_SUBST(IMAGEMAGICK_LIBS)

Regards,

Fabrice