Estava procurando compilar a LIB gtxwc no Linux e achei estas dicas que podem ser úteis a quem estiver precisando dessas bibliotecas. Instale todos os pacotes de amarelo e, se for o caso, recompile o harbour depois com "make clean" e "make".

You'll need these packages to compile certain contribs and optional Harbour features:

      for gtcrs terminal lib:    $ sudo apt-get install libncurses-dev
      for gtsln terminal lib:    $ sudo apt-get install libslang2-dev OR
                                 $ sudo apt-get install libslang1-dev
      for gtxwc terminal lib:    $ sudo apt-get install libx11-dev libxft-dev
      for console mouse support: $ sudo apt-get install libgpm-dev OR
                                 $ sudo apt-get install libgpmg1-dev
      for contrib/gtalleg lib:   $ sudo apt-get install liballegro4.2-dev
      for contrib/hbcairo lib:   $ sudo apt-get install libcairo2-dev
      for contrib/hbcups lib:    $ sudo apt-get install libcups2-dev
      for contrib/hbcurl lib:    $ sudo apt-get install libcurl4-openssl-dev OR
                                 $ sudo apt-get install libcurl4-gnutls-dev
      for contrib/hbexpat lib:   $ sudo apt-get install libexpat1-dev
      for contrib/hbfbird lib:   $ sudo apt-get install firebird2.1-dev OR
                                 $ sudo apt-get install libfirebird2.0-dev
      for contrib/hbfimage lib:  $ sudo apt-get install libfreeimage-dev
      for contrib/hbgd lib:      $ sudo apt-get install libgd2-xpm-dev OR
                                 $ sudo apt-get install libgd-xpm-dev
      for contrib/hbgs lib:      $ sudo apt-get install libgs-dev
      for contrib/hbmagic lib:   $ sudo apt-get install libmagic-dev
      for contrib/hbmysql lib:   $ sudo apt-get install libmysqlclient15-dev
      for contrib/hbodbc lib:    $ sudo apt-get install unixodbc-dev
      for contrib/hbpgsql lib:   $ sudo apt-get install libpq-dev
      for contrib/hbqt lib:      $ sudo apt-get install libqt4-dev

      Optional, to override locally hosted sources:

      for bzip2 support:         $ sudo apt-get install libbz2-dev
      for zlib support:          $ sudo apt-get install zlib1g-dev
      for pcre (regex) support:  $ sudo apt-get install libpcre3-dev
      for contrib/hbsqlit3 lib:  $ sudo apt-get install libsqlite3-dev