diff --git a/mkspecs/win32-g++/qmake.conf b/mkspecs/win32-g++/qmake.conf
index d46294b..ecc6700 100644
--- a/mkspecs/win32-g++/qmake.conf
+++ b/mkspecs/win32-g++/qmake.conf
@@ -32,6 +32,7 @@ QMAKE_CFLAGS_WARN_OFF	= -w
 QMAKE_CFLAGS_RELEASE	= -O2
 QMAKE_CFLAGS_DEBUG	= -g
 QMAKE_CFLAGS_YACC	= -Wno-unused -Wno-parentheses
+QMAKE_CFLAGS_LTCG       = -flto
 QMAKE_CFLAGS_SSE2       = -msse2
 QMAKE_CFLAGS_SSE3       = -msse3
 QMAKE_CFLAGS_SSSE3      = -mssse3
@@ -50,6 +51,7 @@ QMAKE_CXXFLAGS_WARN_OFF	= $$QMAKE_CFLAGS_WARN_OFF
 QMAKE_CXXFLAGS_RELEASE	= $$QMAKE_CFLAGS_RELEASE
 QMAKE_CXXFLAGS_DEBUG	= $$QMAKE_CFLAGS_DEBUG
 QMAKE_CXXFLAGS_YACC	= $$QMAKE_CFLAGS_YACC
+QMAKE_CXXFLAGS_LTCG     = $$QMAKE_CFLAGS_LTCG
 QMAKE_CXXFLAGS_THREAD	= $$QMAKE_CFLAGS_THREAD
 QMAKE_CXXFLAGS_RTTI_ON	= -frtti
 QMAKE_CXXFLAGS_RTTI_OFF	= -fno-rtti
@@ -74,6 +76,7 @@ QMAKE_LFLAGS_DEBUG	=
 QMAKE_LFLAGS_CONSOLE	= -Wl,-subsystem,console
 QMAKE_LFLAGS_WINDOWS	= -Wl,-subsystem,windows
 QMAKE_LFLAGS_DLL        = -shared
+QMAKE_LFLAGS_LTCG     = -flto
 QMAKE_LFLAGS_CXX11      =
 QMAKE_LINK_OBJECT_MAX	= 10
 QMAKE_LINK_OBJECT_SCRIPT= object_script