pthreads for Makefiles/cygwin (don't forget to update lib/windows).

source/Makefile

@@ -212,6 +212,7 @@ endif
 ifeq ($(OS), windows)
     ifeq ($(FREE_WINDOWS), true)
         COMLIB += $(NAN_SDL)/lib/libSDL.a
+        COMLIB += $(NAN_PTHREADS)/lib/libpthreadGC2.a
     else
         COMLIB += $(NAN_SDL)/lib/SDL.lib
     endif

source/blender/blenlib/intern/Makefile

@@ -56,9 +56,10 @@ CPPFLAGS += -I$(SRCHOME)/blender/blenkernel
 CPPFLAGS += -I../../include/
 # path to zlib
 CPPFLAGS += -I$(NAN_ZLIB)/include
-# path to sdl for threads
-CPPFLAGS += $(NAN_SDLCFLAGS)
 
+ifdef NAN_PTHREADS
+  CPPFLAGS += -I$(NAN_PTHREADS)/include
+endif
 ifeq ($(WITH_FREETYPE2), true)
 	CPPFLAGS += -DWITH_FREETYPE2
 endif

source/nan_definitions.mk

@@ -100,6 +100,7 @@ endif
     export WITH_OPENEXR ?= true
     ifeq ($(OS),windows)
       ifeq ($(FREE_WINDOWS), true)
+        export NAN_PTHREADS ?= $(LCGDIR)/pthreads
         export NAN_OPENEXR ?= $(LCGDIR)/gcc/openexr
         export NAN_OPENEXR_LIBS ?= $(NAN_OPENEXR)/lib/libIlmImf.a $(NAN_OPENEXR)/lib/libHalf.a $(NAN_OPENEXR)/lib/libIex.a
         export NAN_OPENEXR_INC ?= -I$(NAN_OPENEXR)/include -I$(NAN_OPENEXR)/include/OpenEXR