Bug: https://bugs.gentoo.org/897946
Don't use sig_unblock and other such functions, they are deprecated.
--- a/src/cdb_make.c
+++ b/src/cdb_make.c
@@ -15,7 +15,7 @@ int cdb_make_start(struct cdb_make *c,int fd)
   c->numentries = 0;
   c->fd = fd;
   c->pos = sizeof c->final;
-  buffer_init(&c->b,write,fd,c->bspace,sizeof c->bspace);
+  buffer_init(&c->b,(void *)write,fd,c->bspace,sizeof c->bspace);
   return seek_set(fd,c->pos);
 }
 
--- a/src/pathexec_run.c
+++ b/src/pathexec_run.c
@@ -1,5 +1,6 @@
 /* Public domain. */
 
+#include <unistd.h>
 #include "error.h"
 #include "stralloc.h"
 #include "str.h"
--- a/src/prot.c
+++ b/src/prot.c
@@ -1,5 +1,7 @@
 /* Public domain. */
 
+#include <grp.h>
+#include <unistd.h>
 #include "hasshsgr.h"
 #include "prot.h"
 
--- a/src/seek_set.c
+++ b/src/seek_set.c
@@ -1,6 +1,7 @@
 /* Public domain. */
 
 #include <sys/types.h>
+#include <unistd.h>
 #include "seek.h"
 
 #define SET 0 /* sigh */
--- a/src/sig_block.c
+++ b/src/sig_block.c
@@ -6,35 +6,23 @@
 
 void sig_block(int sig)
 {
-#ifdef HASSIGPROCMASK
   sigset_t ss;
   sigemptyset(&ss);
   sigaddset(&ss,sig);
   sigprocmask(SIG_BLOCK,&ss,(sigset_t *) 0);
-#else
-  sigblock(1 << (sig - 1));
-#endif
 }
 
 void sig_unblock(int sig)
 {
-#ifdef HASSIGPROCMASK
   sigset_t ss;
   sigemptyset(&ss);
   sigaddset(&ss,sig);
   sigprocmask(SIG_UNBLOCK,&ss,(sigset_t *) 0);
-#else
-  sigsetmask(sigsetmask(~0) & ~(1 << (sig - 1)));
-#endif
 }
 
 void sig_blocknone(void)
 {
-#ifdef HASSIGPROCMASK
   sigset_t ss;
   sigemptyset(&ss);
   sigprocmask(SIG_SETMASK,&ss,(sigset_t *) 0);
-#else
-  sigsetmask(0);
-#endif
 }
--- a/src/sig_pause.c
+++ b/src/sig_pause.c
@@ -6,11 +6,7 @@
 
 void sig_pause(void)
 {
-#ifdef HASSIGPROCMASK
   sigset_t ss;
   sigemptyset(&ss);
   sigsuspend(&ss);
-#else
-  sigpause(0);
-#endif
 }
Binary files a/src/sig_pause.o and b/src/sig_pause.o differ
--- a/src/udpsvd.c
+++ b/src/udpsvd.c
@@ -268,7 +268,7 @@ int main(int argc, const char **argv, const char *const *envp) {
     if (user) {
       bufnum[fmt_ulong(bufnum, ugid.uid)] =0;
       out(", uid "); out(bufnum);
-      bufnum[fmt_ulong(bufnum, ugid.gid)] =0;
+      bufnum[fmt_ulong(bufnum, (unsigned long) ugid.gid)] =0;
       out(", gid "); out(bufnum);
     }
     flush(", starting.\n");
--- a/src/chkshsgr.c
+++ b/src/chkshsgr.c
@@ -1,5 +1,7 @@
 /* Public domain. */
 
+#define _GNU_SOURCE
+#include <grp.h>
 #include <unistd.h>
 
 int main()
--- a/src/tcpsvd.c
+++ b/src/tcpsvd.c
@@ -1,6 +1,8 @@
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <netinet/in.h>
+#define _GNU_SOURCE
+#include <grp.h>
 #include <unistd.h>
 #include "dns.h"
 #include "socket.h"
--- a/src/udpsvd.c
+++ b/src/udpsvd.c
@@ -1,7 +1,9 @@
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <netinet/in.h>
+#define _GNU_SOURCE
 #include <unistd.h>
+#include <grp.h>
 #include "dns.h"
 #include "socket.h"
 #include "ip4.h"