The js_decker_html variable should be defined in c/resources.h which should be automatically built when it needs to be.
js_decker_html
c/resources.h
If you rm c/resources.h and then make V=1 c/resources.h do you get any error message?
rm c/resources.h
make V=1 c/resources.h
Doing that solved the issue! Thanks!:-) You're getting a special thanks in my first decker project lol