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To: cs551@merlot.usc.edu
Subject: Re: Library Reference
Date: Wed, 10 Sep 2008 19:27:07 -0700
From: Bill Cheng <william@bourbon.usc.edu>

Someone wrote:

  > Any Idea what other library I need to link or .h I need to include?
  > 
  > Regards,
  > 
  > Alex
  > 
  > g++ -o client Client.o Common.o ClientParse.o
  > -L/home/scf-22/csci551b/openssl/lib -lcrypto -lsocket
  > Undefined                       first referenced
  >  symbol                             in file
  > gethostbyname                       Client.o  (symbol belongs to implicit
  > dependency /usr/lib/libnsl.so.1)
  > inet_addr                           Common.o  (symbol belongs to implicit
  > dependency /usr/lib/libnsl.so.1)
  > inet_ntoa                           Client.o  (symbol belongs to implicit
  > dependency /usr/lib/libnsl.so.1)
  > ld: fatal: Symbol referencing errors. No output written to client
  > collect2: ld returned 1 exit status
  > *** Error code 1
  > make: Fatal error: Command failed for target `client'
  > nunki.usc.edu(129):

The linker is giving you hints...  It says that you need to
link to "libnsl.so.1".  So, the name of the library is "nsl".
Therefore, you should try "-lnsl".
--
Bill Cheng // bill.cheng@usc.edu <URL:http://merlot.usc.edu/william/usc/>