Mandatory:
- Operating system that provide the following interfaces:
- POSIX.1-1990
- POSIX.1b-1993 Realtime extention, Timers (TMR) option
- POSIX.1c-1996 Threads (THR) extension
- 4.3BSD socket API (with a 'select()' implementation that supports sockets)
- POSIX.2-1992 compliant shell and utilities
- POSIX.2a-1992 User Portability Utilities (UP) extension
- getconf
Utility from X/Open Portability Guide Issue 4 (XPG4) to query system variables
- C/C++ compiler
Should be a matching pair that is C90/C++98 compliant.
- FLTK 1.3 (compiled with multithreading support enabled)
Optional:
- POSIX.2-1992 C language binding (CLB)
Required if the filter (scoring) subsystem should handle regular expressions
Required if the filter (scoring) subsystem should handle group wildmats
- POSIX.1b-1993 realtime extention, File Synchronization (FSC) option
If available, 'fsync()' is executed on config, group and database files after
changes
- POSIX.1-2001
If available, the timestamp in the "Date" headerfield is created in local time
- Operating system with X/Open System Interface (XSI) extension
(with a 'poll()' implementation that supports sockets)
Required for National Language Support (NLS)
Required for automatic TLS certificate CRL maintenance (EXPERIMENTAL)
- OpenSSL 1.x or LibreSSL 2.x
Required for Transport Layer Security (TLS) support
Required for generation of Cancel-Lock and Cancel-Key header fields
- zlib
Sourcecode for zlib can be downloaded from <http://zlib.net/>
Required for NNTP compression extension (DEFLATE algorithm)
- xdg-utils
Required for sending e-mail and clicking on hyperlinks that cannot be
handled internally
- makedepend
Required if the compilers preprocessor can't create dependencies
- troff2html (from the troffcvt package)
Required to build the HTML version of the man page
- doxygen
Required to build the documentation (except the manual page)
- LaTeX
Required to build the documentation (except the manual page)
