>configure --prefix=$prefix \
   --sysconfdir=$etc --with-configdir=$etc --with-nsd_conf_file=$etc \
   --localstatedir=$var \
   --mandir=$man \
   --with-chroot=$prefix \
   --with-xfrdir=$var/tmp \
   --with-user=$username \
   --with-ssl=$foot/share/openssl \
   --with-libevent=no \
   --enable-checking \
   --enable-ratelimit \
   --enable-pie \
   --enable-relro-now \
   --disable-flto \
   --disable-largefile

[...]
checking for gawk... gawk
checking for grep that handles long lines and -e... (cached) /usr/bin/grep
checking for egrep... (cached) /usr/bin/grep -E
checking for flex... flex
checking lex output file root... lex.yy
checking lex library... -lfl
checking whether yytext is a pointer... yes
checking for bison... bison -y
checking whether ln -s works... yes
checking for a BSD-compatible install... /usr/local/bin/ginstall -c
checking whether lex accepts -i... yes
checking if lex defines yy_current_buffer... no
checking for an ANSI C-conforming const... yes
checking for inline... inline
checking for uid_t in sys/types.h... yes
...

In file included from dns.c:24:
./zonec.h:120:37: warning: this function declaration is not a prototype [-Wstrict-prototypes]
void zadd_rdata_txt_clean_wireformat();
                                    ^
                                     void

In file included from rdata.c:25:
./zonec.h:120:37: warning: this function declaration is not a prototype [-Wstrict-prototypes]
void zadd_rdata_txt_clean_wireformat();
                                    ^
                                     void

In file included from tsig.c:16:
./tsig-openssl.h:25:27: warning: this function declaration is not a prototype [-Wstrict-prototypes]
void tsig_openssl_finalize();
                          ^
                           void

In file included from tsig-openssl.c:14:
./tsig-openssl.h:25:27: warning: this function declaration is not a prototype [-Wstrict-prototypes]
void tsig_openssl_finalize();
                          ^
                           void

In file included from util.c:38:
./zonec.h:120:37: warning: this function declaration is not a prototype [-Wstrict-prototypes]
void zadd_rdata_txt_clean_wireformat();
                                    ^
                                     void

ipc.c:53:2: warning: code will never be executed [-Wunreachable-code]
        exit(0);
        ^~~~

server.c:1657:4: warning: code will never be executed [-Wunreachable-code]
                        exit(0);
                        ^~~~
server.c:1854:3: warning: code will never be executed [-Wunreachable-code]
                log_crypto_err("Error in SSL_CTX_ecdh_auto, not enabling ECDHE");
                ^~~~~~~~~~~~~~

In file included from dbaccess.c:29:
./zonec.h:120:37: warning: this function declaration is not a prototype [-Wstrict-prototypes]
void zadd_rdata_txt_clean_wireformat();
                                    ^
                                     void

In file included from zlexer.lex:26:
./zonec.h:120:37: warning: this function declaration is not a prototype [-Wstrict-prototypes]
void zadd_rdata_txt_clean_wireformat();
                                    ^
                                     void

In file included from zonec.c:35:
./zonec.h:120:37: warning: this function declaration is not a prototype [-Wstrict-prototypes]
void zadd_rdata_txt_clean_wireformat();
                                    ^
                                     void

In file included from zparser.y:19:
./zonec.h:120:37: warning: this function declaration is not a prototype [-Wstrict-prototypes]
void zadd_rdata_txt_clean_wireformat();
                                    ^
                                     void

In file included from nsd-checkzone.c:23:
./zonec.h:120:37: warning: this function declaration is not a prototype [-Wstrict-prototypes]
void zadd_rdata_txt_clean_wireformat();
                                    ^
                                     void

nsd-control.c:66:18: warning: this function declaration is not a prototype [-Wstrict-prototypes]
static void usage() ATTR_NORETURN;
                 ^
                  void