ensure bundled tbb's headers are used

kevinushey · kevinushey · commit 3e4489339aa9 · 2020-03-14T12:18:15.000-07:00
diff --git a/src/Makevars.in b/src/Makevars.in
@@ -1,4 +1,6 @@
-PKG_CXXFLAGS += @CXX11STD@ -I../inst/include/
+
+PKG_CPPFLAGS = -I../inst/include
+PKG_CXXFLAGS = @CXX11STD@
 
 ifeq ($(OS), Windows_NT)
 
