diff --git a/doc/build-osx.md b/doc/build-osx.md
index ffa8ada4..23ebda38 100644
--- a/doc/build-osx.md
+++ b/doc/build-osx.md
@@ -41,7 +41,7 @@ Instructions: HomeBrew
 
 #### Install dependencies using Homebrew
 
-        brew install boost miniupnpc openssl berkeley-db4
+        brew install boost miniupnpc openssl berkeley-db4 autoconf automake
 
 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
@@ -73,6 +73,7 @@ Instead, it's enough to make sure the right openssl binary is on your $PATH:
         export BOOST_LIB_SUFFIX=-mt
         export LDFLAGS="-L$OPENSSL_LIB_PATH -L$BDB_LIB_PATH -L$BOOST_LIB_PATH"
         export CPPFLAGS="-I$OPENSSL_INCLUDE_PATH -I$BDB_INCLUDE_PATH -I$BOOST_INCLUDE_PATH"
+        export PATH=${BDB_INCLUDE_PATH}:${PATH}
 
 3. Build libtorrent
 
diff --git a/libtorrent/build-aux/config.guess b/libtorrent/build-aux/config.guess
old mode 100755
new mode 100644
diff --git a/src/core.h b/src/core.h
index d1e05763..bea5d1b9 100644
--- a/src/core.h
+++ b/src/core.h
@@ -404,7 +404,6 @@ public:
 
     template<typename Stream>
     void Unserialize(Stream &s, int nType, int nVersion) {
-        unsigned int nCode = 0;
         // version
         ::Unserialize(s, VARINT(this->nVersion), nType, nVersion);
         // header code
diff --git a/src/leveldb/table/table.cc b/src/leveldb/table/table.cc
index dbd6d3a1..71c1756e 100644
--- a/src/leveldb/table/table.cc
+++ b/src/leveldb/table/table.cc
@@ -228,7 +228,6 @@ Status Table::InternalGet(const ReadOptions& options, const Slice& k,
         !filter->KeyMayMatch(handle.offset(), k)) {
       // Not found
     } else {
-      Slice handle = iiter->value();
       Iterator* block_iter = BlockReader(this, options, iiter->value());
       block_iter->Seek(k);
       if (block_iter->Valid()) {
diff --git a/src/leveldb/util/cache.cc b/src/leveldb/util/cache.cc
index 24f1f63f..2cb5b5f0 100644
--- a/src/leveldb/util/cache.cc
+++ b/src/leveldb/util/cache.cc
@@ -116,7 +116,6 @@ class HandleTable {
       LRUHandle* h = list_[i];
       while (h != NULL) {
         LRUHandle* next = h->next_hash;
-        Slice key = h->key();
         uint32_t hash = h->hash;
         LRUHandle** ptr = &new_list[hash & (new_length - 1)];
         h->next_hash = *ptr;