add libtool

fix #108

doc/build-osx.md

@@ -41,7 +41,7 @@ Instructions: HomeBrew
 
 #### Install dependencies using Homebrew
 
-    brew install boost miniupnpc openssl berkeley-db4 autoconf automake
+    brew install boost miniupnpc openssl berkeley-db4 autoconf automake libtool
 
 Note: After you have installed the dependencies, you should check that the Brew-installed 
 version of OpenSSL is the one available for compilation. You can check this by typing
@@ -100,7 +100,7 @@ Instructions: MacPorts (UNTESTED!!)
 
 Installing the dependencies using MacPorts is very straightforward.
 
-    sudo port install boost db48@+no_java openssl miniupnpc
+    sudo port install boost db48@+no_java openssl miniupnpc libtool
 
 Once installed dependencies, do: