qsort(3) has in its EXAMPLE a C \n with its backslash unescaped; a quick grep through manpages showed similar errors in CONF_modules_load_file.3.
Index: lib/libc/stdlib/qsort.3 =================================================================== RCS file: /cvs/src/lib/libc/stdlib/qsort.3,v retrieving revision 1.24 diff -u -p -r1.24 qsort.3 --- lib/libc/stdlib/qsort.3 22 Jan 2019 06:49:17 -0000 1.24 +++ lib/libc/stdlib/qsort.3 19 Mar 2019 16:49:59 -0000 @@ -179,7 +179,7 @@ main() qsort(array, N, sizeof(array[0]), cmp); for (i = 0; i < N; i++) - printf("%s\n", array[i]); + printf("%s\en", array[i]); } Index: lib/libcrypto/man/CONF_modules_load_file.3 =================================================================== RCS file: /cvs/src/lib/libcrypto/man/CONF_modules_load_file.3,v retrieving revision 1.7 diff -u -p -r1.7 CONF_modules_load_file.3 --- lib/libcrypto/man/CONF_modules_load_file.3 22 Mar 2018 21:08:22 -0000 1.7 +++ lib/libcrypto/man/CONF_modules_load_file.3 19 Mar 2019 16:49:59 -0000 @@ -163,7 +163,7 @@ Load a configuration file and print out file considered fatal): .Bd -literal if (CONF_modules_load_file(NULL, NULL, 0) <= 0) { - fprintf(stderr, "FATAL: error loading configuration file\n"); + fprintf(stderr, "FATAL: error loading configuration file\en"); ERR_print_errors_fp(stderr); exit(1); } @@ -174,7 +174,7 @@ by "myapp", tolerate missing files, but .Bd -literal if (CONF_modules_load_file(NULL, "myapp", CONF_MFLAGS_IGNORE_MISSING_FILE) <= 0) { - fprintf(stderr, "FATAL: error loading configuration file\n"); + fprintf(stderr, "FATAL: error loading configuration file\en"); ERR_print_errors_fp(stderr); exit(1); } @@ -185,7 +185,7 @@ error, missing configuration file ignore .Bd -literal if (CONF_modules_load_file("/something/app.cnf", "myapp", CONF_MFLAGS_IGNORE_MISSING_FILE) <= 0) { - fprintf(stderr, "WARNING: error loading configuration file\n"); + fprintf(stderr, "WARNING: error loading configuration file\en"); ERR_print_errors_fp(stderr); } .Ed @@ -198,17 +198,17 @@ long eline; fp = fopen("/somepath/app.cnf", "r"); if (fp == NULL) { - fprintf(stderr, "Error opening configuration file\n"); + fprintf(stderr, "Error opening configuration file\en"); /* Other missing configuration file behaviour */ } else { cnf = NCONF_new(NULL); if (NCONF_load_fp(cnf, fp, &eline) == 0) { - fprintf(stderr, "Error on line %ld of configuration file\n", + fprintf(stderr, "Error on line %ld of configuration file\en", eline); ERR_print_errors_fp(stderr); /* Other malformed configuration file behaviour */ } else if (CONF_modules_load(cnf, "appname", 0) <= 0) { - fprintf(stderr, "Error configuring application\n"); + fprintf(stderr, "Error configuring application\en"); ERR_print_errors_fp(stderr); /* Other configuration error behaviour */ }