/c/workspace/rockbox/tools/genlang -v -e=/c/workspace/rockbox/apps/lang/english.lang -t=sansaclipplus -i=66 -b=/c/workspace/rockbox/build/apps/lang/thai.lng /c/workspace/rockbox/apps/lang/thai.lang
Usage: genlang [options] <langv2 file>

 -p=<prefix>
    Make the tool create a [prefix].c and [prefix].h file.

 -b=<outfile>
    Make the tool create a binary language (.lng) file named [outfile].
    The use of this option requires that you also use -e, -t and -i.
...