title: library not found for -lrt with QtCreator [mac os]
body: <p>i'm getting some troubles with QT it builds with option "-lrt" </p>
  
  <p>i'm using mac os 10.6 with QT creator 1.2.1, heeeeeeelp ! </p>
  
  <p>this is the full build command : </p>
  
  <blockquote>
    <p>g++ -headerpad_max_install_names -o
    AMiningCoreTest main.o tokenizer.o
    DictionnaryToolBox.o mysql.o btree.o
    BTreeDataTable.o tcaccess.o
    -L/Library/Frameworks -L/usr/lib/mysql -lmysqlclient -L/usr/local/lib/ -ltokyocabinet -lz -lbz2 -lrt -lpthread -lm -lc</p>
  </blockquote>
  
  <p>and it ends with</p>
  
  <blockquote>
    <p>ld: library not found for -lrt
    collect2: ld returned 1 exit status</p>
  </blockquote>