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+This subsystem ensures that we can always use a certain core set of 
+functions and types, that are either provided by the OS or by replacement 
+functions / definitions in this subsystem. The aim is to try to stick 
+to POSIX functions in here as much as possible. Convenience functions 
+that are available on no platform at all belong in other subsystems
+(such as LIBUTIL).
+
+The following functions are guaranteed:
+
+ftruncate
+strlcpy
+strlcat
+mktime
+rename
+initgroups
+memmove
+strdup
+setlinebuf
+vsyslog
+timegm
+setenv
+unsetenv
+strndup
+strnlen
+waitpid
+seteuid
+setegid
+asprintf
+snprintf
+vasprintf
+vsnprintf
+opendir
+readdir
+telldir
+seekdir
+clock_gettime
+closedir
+dlopen
+dlclose
+dlsym
+dlerror
+chroot
+bzero
+strerror
+errno
+mkdtemp
+mkstemp (a secure one!)
+pread
+pwrite
+chown
+lchown
+readline (the library)
+inet_ntoa
+inet_ntop
+inet_pton
+inet_aton
+strtoll
+strtoull
+socketpair
+strptime
+getaddrinfo
+freeaddrinfo
+getnameinfo
+gai_strerror
+getifaddrs
+freeifaddrs
+utime
+utimes
+dup2
+link
+readlink
+symlink
+realpath
+poll
+setproctitle
+memset_s
+
+Types:
+bool
+socklen_t
+uint{8,16,32,64}_t
+int{8,16,32,64}_t
+intptr_t
+sig_atomic_t
+blksize_t
+blkcnt_t
+
+Constants:
+PATH_NAME_MAX
+UINT{16,32,64}_MAX
+INT32_MAX
+RTLD_LAZY
+HOST_NAME_MAX
+UINT16_MAX
+UINT32_MAX
+UINT64_MAX
+CHAR_BIT
+
+Macros:
+va_copy
+__FUNCTION__
+__FILE__
+__LINE__
+__LINESTR__
+__location__
+__STRING
+__STRINGSTRING
+MIN
+MAX
+QSORT_CAST
+ZERO_STRUCT
+ZERO_STRUCTP
+ZERO_STRUCTPN
+ZERO_ARRAY
+ARRAY_SIZE
+PTR_DIFF
+
+Headers:
+stdint.h
+stdbool.h
+
+Optional C keywords:
+volatile
+
+Prerequisites:
+memset (for bzero)
+syslog (for vsyslog)
+mktemp (for mkstemp and mkdtemp)