Patch submitted by Nic Schraudolph to fix compiling problems on Mac OS X.

include/lbfgs.h

@@ -598,6 +598,9 @@ libLBFGS is distributed under the term of the
 <a href="http://opensource.org/licenses/mit-license.php">MIT license</a>.
 
 @section changelog History
+- Version 1.10 (2010-xx-xx):
+    - Fixed compiling errors on Mac OS X; this patch was kindly submitted by
+      Nic Schraudolph.
 - Version 1.9 (2010-01-29):
     - Fixed a mistake in checking the validity of the parameters "ftol" and
       "wolfe"; this was discovered by Kevin S. Van Horn.
@@ -718,6 +721,7 @@ Special thanks go to:
     - Yoshimasa Tsuruoka and Daisuke Okanohara for technical information about
       OWL-QN
     - Takashi Imamichi for the useful enhancements of the backtracking method
+    - Kevin S. Van Horn and Nic Schraudolph for bug fixes
 
 Finally I would like to thank the original author, Jorge Nocedal, who has been
 distributing the effieicnt and explanatory implementation in an open source