rem: printf("usage: %s [-cutbuffer number]\n", progn);
add: fprintf(stderr, "usage: %s [options]\n" "	-display display-name\n" "	-cutbuffer number\n" "	-selection [selection-name]\n" , progn);
context: help(char *progn){    printf("usage: %s [-cutbuffer number]\n", progn);}