diff --git a/headers/posix/unistd.h b/headers/posix/unistd.h
index fd2c0684cb..88efb7143f 100644
--- a/headers/posix/unistd.h
+++ b/headers/posix/unistd.h
@@ -131,6 +131,10 @@
 #define	_SC_TIMERS						58
 #define	_SC_CPUTIME						59
 #define	_SC_THREAD_CPUTIME				60
+#define _SC_HOST_NAME_MAX				61
+#define _SC_REGEXP						62
+#define _SC_SYMLOOP_MAX					63
+#define _SC_SHELL						64
 
 
 /* confstr() constants */
diff --git a/src/system/libroot/posix/unistd/conf.cpp b/src/system/libroot/posix/unistd/conf.cpp
index b05dab5364..1bcc8d1e73 100644
--- a/src/system/libroot/posix/unistd/conf.cpp
+++ b/src/system/libroot/posix/unistd/conf.cpp
@@ -71,14 +71,22 @@ __sysconf(int name)
 			return CLK_TCK;
 		case _SC_JOB_CONTROL:
 			return 1;
+		case _SC_HOST_NAME_MAX:
+			return _POSIX_HOST_NAME_MAX;
 		case _SC_NGROUPS_MAX:
 			return NGROUPS_MAX;
 		case _SC_OPEN_MAX:
 			return getdtablesize();
+		case _SC_REGEXP:
+			return 1;
 		case _SC_SAVED_IDS:
 			return 1;
+		case _SC_SHELL:
+			return 1;
 		case _SC_STREAM_MAX:
 			return STREAM_MAX;
+		case _SC_SYMLOOP_MAX:
+			return SYMLOOP_MAX;
 		case _SC_TZNAME_MAX:
 			return TZNAME_MAX;
 		case _SC_VERSION: