--- a/bootblocks/makeboot.c	2020-11-30 00:28:40.383078094 +0300
+++ b/bootblocks/makeboot.c	2020-11-30 00:28:26.969025659 +0300
@@ -183,6 +183,8 @@
 unsigned char bpb_flags[100];
 int has_bpb_overrides = 0;

+static void check_msdos();
+
 main(argc, argv)
 int argc;
 char ** argv;
@@ -1122,7 +1124,7 @@

 /**************************************************************************/

-check_msdos()
+static void check_msdos()
 {
    decode_super(buffer);
    if( dosflds[DOS_CLUST].value == 0 )	/* MSDOS v1.0 */