title: Trying to use the GNU Scientific Library, but weird linker errors occur
body: <p>so i compiled the GSL from source with Cygwin. Everything went fine, i didnt get any errors. But when i try to compile some simple code, i get the following errors:</p>
  
  <pre><code>..\..\..\Programme\CodeBlocks\MinGW\lib\libgsl.a(error.o) In function `gsl_error':
  \usr\include\gsl\err\error.c|43|undefined reference to `__getreent'
  \usr\include\gsl\err\error.c|44|undefined reference to `__getreent'
  \usr\include\gsl\err\error.c|45|undefined reference to `__getreent'
  ..\..\..\Programme\CodeBlocks\MinGW\lib\libgsl.a(stream.o) In function `gsl_stream_printf':
  \usr\include\gsl\err\stream.c|37|undefined reference to `__getreent'
  ..\..\..\Programme\CodeBlocks\MinGW\lib\libgsl.a(stream.o) In function `gsl_set_stream':
  \usr\include\gsl\err\stream.c|61|undefined reference to `__getreent'
  </code></pre>
  
  <p>I linked the libgsl.a and libgscblas.a libraries, and there are no complains about any other functions.</p>
  
  <p>For future reference: Dont press cancel instead of Ok when you want to set up a toolchain in code::blocks</p>