Notice out-of-date sysroot folders and complain.

diff --git a/makefile b/makefile
index 855ab7a50f127c8c18ad1b7ba5d874022289ba1e..18dc376d020c289f5f9b3a57a3411510d5fd442f 100644 (file)
--- a/makefile
+++ b/makefile
@@ -113,8 +113,8 @@ Images/%.png: %.png
        @echo "[pngc] $<"
        @./pngcrush.sh $< $@
 
-sysroot:
-       @echo "Please read compiling.txt: you do not have a ./sysroot/ folder with the on-device requirements." 1>&2
+sysroot: sysroot.sh
+       @echo "Your ./sysroot/ is either missing or out of date. Please read compiling.txt for help." 1>&2
        @echo 1>&2
        @exit 1