check for ImageMagick and fail gracefully

diff --git a/examples/graphics/bitmap/24bit-color/Makefile b/examples/graphics/bitmap/24bit-color/Makefile
index 2f1f54ab816f106ac81fd76beb4373042a573c56..ffdb5a8559f47b4f59dfd9e2b073cb971187bdaf 100755 (executable)
--- a/examples/graphics/bitmap/24bit-color/Makefile
+++ b/examples/graphics/bitmap/24bit-color/Makefile
@@ -117,11 +117,26 @@ else
        export APP_ICON := $(TOPDIR)/$(ICON)
 endif
 
+IMAGEMAGICK    :=      $(shell which convert)
+
+
 .PHONY: $(BUILD) clean all
 
 #---------------------------------------------------------------------------------
+ifeq ($(strip $(IMAGEMAGICK)),)
+
+all:
+       @echo "Image Magick not found!"
+       @echo
+       @echo "Please install Image Magick from http://www.imagemagick.org/ to build this example"
+
+else
+
 all: $(BUILD)
 
+endif
+
+#---------------------------------------------------------------------------------
 $(BUILD):
        @[ -d $@ ] || mkdir -p $@
        @make --no-print-directory -C $(BUILD) -f $(CURDIR)/Makefile