How to echo a "$" to a file in Makefile.am

[Lyre]

 In Makefile.am, I wrote an custom rule which append the program's path to
the startup script. it looks like:

    echo $(datadir)/myprogram/program-name $OPTIONS >> /bin/program-name

I want to get :

    /usr/share/myprogram/program-name $OPTIONS

however, waht I accully get is :

    /usr/share/myprogram/program-name PTIONS

I try to add an '\' before '$', but it doesn't works.