grc accepts the following options:
-f force the writing of the output files
-o name name the .c output file
-s name name the .s output file
-l name name the ld65 output file
-h show this help
grc -vlir output.cvt header.bin vlir0.bin vlir1.bin ...
.h and .s. grc will not overwrite existing files unless forced
to do so. That is done to avoid situations where you have test.c and
test.grc files. Both would put their output into test.s. For that
reason, you should name your resource-files differently than sources, e.g.,
resource.grc or apphead.grc.