===> Building for nitro-0.5
clang  -Os -Wall -Wno-unused-parameter -Wextra -Wwrite-strings -Wno-string-plus-int -L/opt/pkg/lib -o nitro nitro.c -lm
nitro.c:421:6: warning: call to undeclared function 'pipe2'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
        if (pipe2(alivepipefd, O_CLOEXEC) < 0) {
            ^
nitro.c:1141:8: warning: call to undeclared function 'pipe2'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
                        if (pipe2(services[j].log_in, O_CLOEXEC) < 0) {
                            ^
nitro.c:1353:48: error: use of undeclared identifier 'SOCK_CLOEXEC'
        int checksock = socket(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0);
                                                      ^
nitro.c:1366:45: error: use of undeclared identifier 'SOCK_CLOEXEC'
        controlsock = socket(AF_UNIX, SOCK_DGRAM | SOCK_CLOEXEC, 0);
                                                   ^
nitro.c:1828:3: warning: call to undeclared function 'dup3'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
                dup3(nullfd, 3, O_CLOEXEC);
                ^
nitro.c:1873:6: warning: call to undeclared function 'pipe2'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
        if (pipe2(selfpipe, O_NONBLOCK | O_CLOEXEC) < 0)
            ^
4 warnings and 2 errors generated.
gmake: *** [Makefile:11: nitro] Error 1
*** Error code 2

Stop.
bmake[1]: stopped making "all" in /Volumes/data/jenkins/workspace/pkgsrc-macos-trunk-arm64/sysutils/nitro
*** Error code 1

Stop.
bmake: stopped making "all" in /Volumes/data/jenkins/workspace/pkgsrc-macos-trunk-arm64/sysutils/nitro