make sure BDB_INCLUDE_PATH is in the PATH for Mac users as it can be in conflict with existing BDB installation.

doc/build-osx.md

@@ -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