enforce non-parallel make on Windows

kevinushey · kevinushey · commit d901276a8aff · 2016-08-15T12:57:56.000-07:00
diff --git a/src/Makevars b/src/Makevars
@@ -8,6 +8,7 @@ ifeq ($(OS), Windows_NT)
   USE_TBB=Windows
   TBB_COPY_PATTERN=tbb*.dll
   
+  MAKEFLAGS = -j1
   MAKE_CMD = CONLY="$(CC)" CPLUS="$(CXX1X)" make
 
 else
