diff -Naur z88dk.old/src/appmake/m5.c z88dk/src/appmake/m5.c
--- z88dk.old/src/appmake/m5.c	2018-09-17 05:00:12.000000000 +0200
+++ z88dk/src/appmake/m5.c	2020-05-31 14:52:29.889764807 +0200
@@ -15,7 +15,6 @@
 static char              help         = 0;
 static char              audio        = 0;
 static char              fast         = 0;
-unsigned long            checksum;
 
 
 /* Options that are available for this module */
@@ -83,6 +82,7 @@
     int c;
     int i;
     int len, blocklen;
+    unsigned long checksum;
 
     if (help)
         return -1;
diff -Naur z88dk.old/src/appmake/sc3000.c z88dk/src/appmake/sc3000.c
--- z88dk.old/src/appmake/sc3000.c	2019-06-12 05:00:08.000000000 +0200
+++ z88dk/src/appmake/sc3000.c	2020-05-31 14:51:58.861726767 +0200
@@ -21,8 +21,6 @@
 static char              survivors    = 0;
 static char              sf7000       = 0;
 
-unsigned long            checksum;
-
 
 /* Options that are available for this module */
 option_t sc3000_options[] = {
@@ -112,6 +110,8 @@
     FILE *fpin, *fpout;
     long pos=0, blocklen;
     int c, i, len;
+    unsigned long checksum;
+
 
     if (help)
         return -1;