mkc_check_prog - detects presense of header file.

       Aleksey Cheusov <vle@gmx.net>

                                                  Aug 29, 2009                                 MKC_CHECK_PROG(1)

mkc_check_prog  takes a name and looks for the file with that name which would be executable.  Executable
       is searched for along the user's PATH.  If appropriate executable is found, a  path  to  it  is  printed.
       Otherwise, an error message is printed and mkc_check_prog exits with error.

PATH   List of colon-separated directories.

       MKC_VERBOSE
              If set to 1, verbose messages are output to stderr.

       MKC_SHOW_CACHED
              If set to 1 and MKC_VERBOSE is set to 1, cached results are output to stderr.

       MKC_CACHEDIR
              Directory  where  temporary  and  cache files are created.  If unset they are created in a current
              directory.

       MKC_NOCACHE
              All results are cached unless MKC_NOCACHE variable is set to 1.

       MKC_DELETE_TMPFILES
              If set to 1, temporary files are removed.

          mkc_check_prog gawk
          mkc_check_prog c++
          mkc_check_prog lua

       mkc_check_prog - detects presense of header file.

-h     Display help message.

       -iprogidprogid will be used as a part of _mkc_* cache file name.

mkc_check_prog<progname>mkc_check_prog-h