fixes all warnings below, because they annoyed me
return type of 'main' is not 'int' [-Wmain-return-type]
diff '--color=auto' -ru a/auto-str.c b/auto-str.c
--- a/auto-str.c	2024-06-28 09:58:21.705876043 -0000
+++ b/auto-str.c	2024-06-28 09:58:28.913833538 -0000
@@ -11,7 +11,7 @@
   if (buffer_puts(&ss1,s) == -1) _exit(111);
 }
 
-void main(argc,argv)
+int main(argc,argv)
 int argc;
 char **argv;
 {
diff '--color=auto' -ru a/cdbdump.c b/cdbdump.c
--- a/cdbdump.c	2024-06-28 09:58:21.706876037 -0000
+++ b/cdbdump.c	2024-06-28 09:58:28.901833608 -0000
@@ -58,7 +58,7 @@
 
 char strnum[FMT_ULONG];
 
-void main()
+int main()
 {
   uint32_t eod;
   uint32_t klen;
diff '--color=auto' -ru a/cdbget.c b/cdbget.c
--- a/cdbget.c	2024-06-28 09:58:21.711876007 -0000
+++ b/cdbget.c	2024-06-28 09:58:28.898833626 -0000
@@ -23,7 +23,7 @@
 static struct cdb c;
 char buf[1024];
 
-void main(int argc,char **argv)
+int main(int argc,char **argv)
 {
   char *key;
   int r;
diff '--color=auto' -ru a/cdbmake.c b/cdbmake.c
--- a/cdbmake.c	2024-06-28 09:58:21.716875978 -0000
+++ b/cdbmake.c	2024-06-28 09:58:28.900833614 -0000
@@ -36,7 +36,7 @@
 
 static struct cdb_make c;
 
-void main(int argc,char **argv)
+int main(int argc,char **argv)
 {
   unsigned int klen;
   unsigned int dlen;
diff '--color=auto' -ru a/cdbstats.c b/cdbstats.c
--- a/cdbstats.c	2024-06-28 09:58:21.718875966 -0000
+++ b/cdbstats.c	2024-06-28 09:58:28.903833597 -0000
@@ -69,7 +69,7 @@
 static unsigned long numrecords;
 static unsigned long numd[11];
 
-void main()
+int main()
 {
   uint32_t eod;
   uint32_t klen;
diff '--color=auto' -ru a/cdbtest.c b/cdbtest.c
--- a/cdbtest.c	2024-06-28 09:58:21.718875966 -0000
+++ b/cdbtest.c	2024-06-28 09:58:28.904833591 -0000
@@ -67,7 +67,7 @@
 
 static struct cdb c;
 
-void main()
+int main()
 {
   uint32_t eod;
   uint32_t klen;
diff '--color=auto' -ru a/install.c b/install.c
--- a/install.c	2024-06-28 09:58:21.719875960 -0000
+++ b/install.c	2024-06-28 09:58:28.928833449 -0000
@@ -137,7 +137,7 @@
     strerr_die6sys(111,FATAL,"unable to chmod .../",subdir,"/",file,": ");
 }
 
-void main()
+int main()
 {
   fdsourcedir = open_read(".");
   if (fdsourcedir == -1)
diff '--color=auto' -ru a/instcheck.c b/instcheck.c
--- a/instcheck.c	2024-06-28 09:58:21.719875960 -0000
+++ b/instcheck.c	2024-06-28 09:58:28.929833443 -0000
@@ -101,7 +101,7 @@
   perm("",home,"/",file,S_IFREG,uid,gid,mode);
 }
 
-void main()
+int main()
 {
   hier();
   _exit(0);
diff '--color=auto' -ru a/testzero.c b/testzero.c
--- a/testzero.c	2024-06-28 09:58:21.720875954 -0000
+++ b/testzero.c	2024-06-28 09:58:28.908833567 -0000
@@ -14,7 +14,7 @@
 static char data[65536];
 struct cdb_make c;
 
-void main(int argc,char **argv)
+int main(int argc,char **argv)
 {
   int fd;
   unsigned long loop;
diff '--color=auto' -ru a/tryulong32.c b/tryulong32.c
--- a/tryulong32.c	2024-06-28 09:58:21.715875984 -0000
+++ b/tryulong32.c	2024-06-28 09:58:28.936833402 -0000
@@ -1,4 +1,4 @@
-void main()
+int main()
 {
   unsigned long u;
   u = 1;