'''tcl::pkgconfig''', proposed by [TIP] [Tcl Improvement Proposal 59%|%59], a
[Tcl commands%|%built-in] Tcl command, first appeared in Tcl version [Changes
in Tcl/Tk 8.5%|%8.5]. 

   ''There is no good reason ever to use tcl::pkgconfig for anything except building.'':   - [Twylite], [http://code.activestate.com/lists/tcl-core/12345/%|%::tcl::pkgconfig error], [Tcl Core Team%|%TCT] mailing list, 2012-11-14

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[dbohdan] 2015-03-12: As of Tcl 8.6.3 the following information is available in through `::tcl::pkgconfig` on Linux (with example values from [Fedora] 21).

| '''name'''  | '''value''' |
| debug | 1 |
| threaded | 1 |
| profiled | 0 |
| 64bit | 0 |
| optimized | 0 |
| mem_debug | 0 |
| compile_debug | 0 |
| compile_stats | 0 |
| libdir,runtime | /usr/lib64 |
| bindir,runtime | /usr/bin |
| scriptdir,runtime | /usr/share/tcl8.6 |
| includedir,runtime | /usr/include |
| docdir,runtime | /usr/share/man |
| libdir,install | /usr/lib64 |
| bindir,install | /usr/bin |
| scriptdir,install | /usr/share/tcl8.6 |
| includedir,install | /usr/include |
| docdir,install | /usr/share/man |

I found the `*,runtime` values useful in building [tcl-augeas%|%a Tcl extension] without having to resort to [autoconf] on systems where no information about Tcl available is from [http://www.freedesktop.org/wiki/Software/pkg-config/%|%pkg-config] (e.g, [Ubuntu]).

[dbohdan] 2015-03-17: On Debian 7:

| '''name'''  | '''value''' |
| debug | 1 |
| threaded | 1 |
| profiled | 0 |
| 64bit | 0 |
| optimized | 1 |
| 64bit | 0 |
| optimized | 1 |
| mem_debug | 0 |
| compile_debug | 0 |
| compile_stats | 0 |
| libdir,runtime | /usr/lib |
| bindir,runtime | /usr/bin |
| scriptdir,runtime | /usr/share/tcltk/tcl8.5 |
| includedir,runtime | /usr/include/tcl8.5 |
| scriptdir,runtime | /usr/share/tcltk/tcl8.5 |
| includedir,runtime | /usr/include/tcl8.5 |
| docdir,runtime | /usr/share/man |
| libdir,install | /usr/lib |
| bindir,install | /usr/bin |
| scriptdir,install | /usr/share/tcltk/tcl8.5 |
| includedir,install | /usr/include/tcl8.5 |
| docdir,install | /usr/share/man |

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