Log Message:
Version 0.34.0, by Aleksey Cheusov, Wed, 19 Feb 2020 22:46:40 +0300

  This release introduces some incompatibilities with older releases:
    - mkc_install -l is changed
    - Target "distclean" is considered deprecated.
      Use target "configure" instead!
    - Remove support for Pascal, Fortran and ObjC.
      Only C and C++ are supported.
    - Do not add ${LEXLIB} to LDADD if SRCS contains .l files.
      You have to add it manually when needed or use new feature "libl".
    - mkc_check_custom: remove options -p and -n
    - LDREAL is either C or C++ compiler, not the linker
    - mkc_check_custom: do not use CARGS anymore
    - Introduce CXXOPTS and CXXOPTS_<prj> variables and
      do not pass COPTS to C++ compiler. COPTS is only for C!

  mk-configure build system changes:
    - Introduce new targets "help", "help_subprj" and \ 
"help_use" and
      appropriate framework for documenting the software project.  See
      mkc_imp.help.mk makefile. mk-configure itself uses this
      framework, so, you can run "bmake help" before build. Also
      introduce the following configuring variables for mk-configure:
      USE_AWK, USE_ID, USE_INSTALL, USE_NM, USE_SH, USE_CC_COMPILERS,
      USE_CXX_COMPILERS. See updated doc/INSTALL.md
    - Add virtual targets "examples" in addition to "tests".
    - Move helpers/* scripts to examples/helpers/ subdirectory. They
      are for testing mk-configure only.

  Mk files:
    * C{,XX}FLAGS.{warns,ssp,pie,pic}, LDFLAGS.pie etc...:
      Defaults for these values are determined at build time by
      checking whether compiler/linker accepts the corresponding
      option.  Load compiler specific options from ~/.mk-c and
      MKFILESDIR directories, and exit with error if they do not
      exist. For generating such settings for compiler absent at build
      time, use newly introduced script "mkc_compiler_settings".
    * C{,XX}FLAGS:
      Pass these flags to the compiler after C{,XX}FLAGS.warns
      for overriding bad warnings/errors
    * MKC_CHECK_{CC,CXX}_OPTS:
      double underline symbols in the option is considered
      as a single space
    * MKC_CHECK_CUSTOM:
      - pass MKC_CUSTOM_{CPPFLAGS,CFLAGS,CXXFLAGS,LDFLAGS,LDADD}.<check_name>
        flags to the compiler
      - introduce variable MKC_CUSTOM_NOAUTO.<checkname>
      - introduce variable MKC_CUSTOM_CACHE.<checkname>
      - introduce variable MKC_CHECK_CCLD_OPTS and MKC_CHECK_CXXLD_OPTS
    * Introduce new variables CC_VERSION and CXX_VERSION determined
      by mkc_check_compiler(1)
    * Introduce INSTALL_FLAGS variables and remove undocumented
      COPY, PRESERVE, INSTPRIV and RENAME
    * Keep initial settings for mk-configure in sys.mk
      instead of mkc_imp.vars.mk
    * Introduce MKC_CUSTOM_LINK.<custom_check_name> variable for link testing
    * Introduce CFLAGS.check and CXXFLAGS.check variables
    * Set CFLAGS.dflt.sunpro to -errtags
    * mkc.conf.mk: undefine MKC_CHECK_CC_OPTS, MKC_CHECK_CXX_OPTS after use
    * Introduce new checks MKC_CHECK_CCLD_OPTS and MKC_CHECK_CXXLD_OPTS
    * Introduce new "help" framework, see mkc_imp.help.mk section in \ 
man page
    * mkc.minitest.mk: minor fix in target "cleandir"

  Features:
    - add support for C++ (extern "C") to all feature header files
    - add new feature "libl" for libl.a or libfl.a

  Utilities:
    * mkc_install:
      - "move" semantic is disabled forever, so flag -c is silently ignored
      - add manual page
      - flag -l is changed and becomes compatible with NetBSD install(1)
      - actually it is almost completely reimplemented
    * mkc_check_compiler:
      - add man page
      - exit status is 2, if bad option is specified
      - CC defaults to "cc" as the documentation says
      - detects not only compiler type, but also a version
      - cache file name for C compiler type is _mkc_cc_type.*
    * mkc_check_custom:
      - switch to getopts
      - add option -l and support for LDFLAGS and LDADD
      - add new option -t and remove options -p and -n
      - do not use CARGS anymore, use CFLAGS and CPPFLAGS instead
    * mkc_which:
      - add man page
    * mkc_check_version:
      - add man page
    * mkc_get_deps:
      - installed to libexec/ instead of bin/

  Documentation update

  Code clean-ups and minor fixes