There's no prebuilt binary available for Big Sur, and during build, the following error occurs:
In file included from verify.c:34:
./util.h:44:8: warning: type specifier missing, defaults to 'int' [-Wimplicit-int]
extern pclose2(FILE *);
~~~~~~ ^
verify.c:181:36: warning: passing 'unsigned char *' to parameter of type 'char *' converts between pointers to integer types with different sign [-Wpointer-sign]
replicate_pattern(pattern, ibuf, input_blocksize);
^~~~
./pattern.h:35:45: note: passing argument to parameter here
extern void replicate_pattern(char *, char *, size_t);
^
verify.c:195:25: warning: format specifies type 'unsigned long long' but the argument has type 'uintmax_t' (aka 'unsigned long') [-Wformat]
w_full, total_mb);
^~~~~~
verify.c:210:43: warning: format specifies type 'unsigned long long' but the argument has type 'uintmax_t' (aka 'unsigned long') [-Wformat]
prcnt, probed_mb, w_full, total_mb, secstr);
^~~~~~
verify.c:226:40: warning: passing 'unsigned char *' to parameter of type 'char *' converts between pointers to integer types with different sign [-Wpointer-sign]
replicate_pattern(pattern, ibuf, v_nread);
^~~~
./pattern.h:35:45: note: passing argument to parameter here
extern void replicate_pattern(char *, char *, size_t);
^
translate.c:160:10: error: implicit declaration of function 'bit_count' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
if ((MX (C_ASCII | C_EBCDIC | C_IBM) > 1)
^
translate.c:159:16: note: expanded from macro 'MX'
#define MX(a) (bit_count (conversions_mask & (a)))
^
In file included from copy.c:34:
./util.h:44:8: warning: type specifier missing, defaults to 'int' [-Wimplicit-int]
extern pclose2(FILE *);
~~~~~~ ^
copy.c:56:37: warning: passing 'unsigned char *' to parameter of type 'const char *' converts between pointers to integer types with different sign [-Wpointer-sign]
int nwritten = outputlist_write(obuf, output_blocksize);
^~~~
./output.h:53:41: note: passing argument to parameter here
extern int outputlist_write(const char *, size_t);
^
1 error generated.
In file included from verify.c:28:
./dcfldd.h:162copy.c:214:36: warning: passing 'unsigned char *' to parameter of type 'char *' converts between pointers to integer types with different sign [-Wpointer-sign]
replicate_pattern(pattern, ibuf, input_blocksize);
^~~~
./pattern.h:35:45: note: passing argument to parameter here
extern void replicate_pattern(char *, char *, size_t);
^
copy.c:226:25: warning: format specifies type 'unsigned long long' but the argument has type 'uintmax_t' (aka 'unsigned long') [-Wformat]
w_full, total_mb);
^~~~~~
:20: warning: inline function 'quit' is not defined [-Wundefined-inline]
extern inline void quit(int);copy.c:240:43:
^
warning: format specifies type 'unsigned long long' but the argument has type 'uintmax_t' (aka 'unsigned long') [-Wformat]
prcnt, probed_mb, w_full, total_mb, secstr);
^~~~~~
verify.c:178:9: note: used here
quit(exit_status);
^
copy.c:306:45: warning: passing 'unsigned char *' to parameter of type 'const char *' converts between pointers to integer types with different sign [-Wpointer-sign]
int nwritten = outputlist_write(obuf, n_bytes_read);
^~~~
./output.h:53:41: note: passing argument to parameter here
extern int outputlist_write(const char *, size_t);
^
copy.c:364:41: warning: passing 'unsigned char *' to parameter of type 'const char *' converts between pointers to integer types with different sign [-Wpointer-sign]
int nwritten = outputlist_write(obuf, oc);
^~~~
./output.h:53:41: note: passing argument to parameter here
extern int outputlist_write(const char *, size_t);
^
In file included from copy.c:23:
./dcfldd.h:162:20: warning: inline function 'quit' is not defined [-Wundefined-inline]
extern inline void quit(int);
^
copy.c:61:9: note: used here
quit(1);
^
In file included from dcfldd.c:63:
./util.h:44:8: warning: type specifier missing, defaults to 'int' [-Wimplicit-int]
extern pclose2(FILE *);
~~~~~~ ^
make[1]: *** [translate.o] Error 1
make[1]: *** Waiting for unfinished jobs....
dcfldd.c:687:9: error: implicit declaration of function 'init_hashlist' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
init_hashlist(&ihashlist, hashops[VERIFY_HASH].flag);
^
dcfldd.c:689:9: error: implicit declaration of function 'init_hashlist' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
init_hashlist(&ihashlist, hashflags);
^
1 warning and 2 errors generated.
make[1]: *** [dcfldd.o] Error 1
6 warnings generated.
8 warnings generated.
make[1]: Leaving directory `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_sysutils_dcfldd/dcfldd/work/dcfldd-1.3.4-1'
make: *** [all] Error 2
make: Leaving directory `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_sysutils_dcfldd/dcfldd/work/dcfldd-1.3.4-1'
Command failed: cd "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_sysutils_dcfldd/dcfldd/work/dcfldd-1.3.4-1" && /usr/bin/make -j8 -w all
Exit code: 2
Error: Failed to build dcfldd: command execution failed
Error: See /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_sysutils_dcfldd/dcfldd/main.log for details.
Error: Follow https://guide.macports.org/#project.tickets to report a bug.
Error: Processing of port dcfldd failed
In cc9e9c45247d7b8df6cdc24551fc90998c42bf5d/macports-ports (master):