There is no missing source archive. There is a "missing" binary archive, but that's because we haven't started making them for Darwin 23 yet. Missing binary archives are not a problem; MacPorts builds from source on your system in that case.
The log shows the reason for the build failure is:
:info:build In file included from ../bytesex.c:209:
:info:build ../../include/stuff/bytesex.h:237:5: error: unknown type name 'i386_thread_state_t'
:info:build i386_thread_state_t *cpu,
:info:build ^
:info:build ../bytesex.c:1378:1: error: unknown type name 'i386_thread_state_t'
:info:build i386_thread_state_t *cpu,
:info:build ^
:info:build 2 errors generated.
:info:build make[2]: *** [bytesex.o] Error 1