--- a/bitcoin-qt.pro
+++ b/bitcoin-qt.pro
@@ -5,7 +5,8 @@
 
 # for boost 1.37, add -mt to the boost libraries
 unix:LIBS += -lssl -lcrypto -lboost_system -lboost_filesystem -lboost_program_options -lboost_thread -ldb_cxx
-macx:DEFINES += __WXMAC_OSX__ MSG_NOSIGNAL=0
+macx:DEFINES += __WXMAC_OSX__ MSG_NOSIGNAL=0 BOOST_FILESYSTEM_VERSION=3
+macx:LIBS += -lboost_thread-mt
 
 # disable quite some warnings because bitcoin core "sins" a lot
 QMAKE_CXXFLAGS_WARN_ON = -fdiagnostics-show-option -Wall -Wno-invalid-offsetof -Wno-unused-variable -Wno-unused-parameter -Wno-sign-compare -Wno-char-subscripts  -Wno-unused-value -Wno-sequence-point -Wno-parentheses -Wno-unknown-pragmas -Wno-switch