The debug targets were removed starting with rev 2020.
This patch restores them.


--- tbb-2020/Makefile.orig	2019-12-18 02:42:41.000000000 -0600
+++ tbb-2020/Makefile	2020-02-09 00:27:17.058452442 -0600
@@ -26,15 +26,19 @@
 all: tbb tbbmalloc tbbproxy test examples
 
 tbb: mkdir
+	$(MAKE) -C "$(work_dir)_debug"  -r -f $(tbb_root)/build/Makefile.tbb cfg=debug
 	$(MAKE) -C "$(work_dir)_release"  -r -f $(tbb_root)/build/Makefile.tbb cfg=release
 
 tbbmalloc: mkdir
+	$(MAKE) -C "$(work_dir)_debug"  -r -f $(tbb_root)/build/Makefile.tbbmalloc cfg=debug malloc
 	$(MAKE) -C "$(work_dir)_release"  -r -f $(tbb_root)/build/Makefile.tbbmalloc cfg=release malloc
 
 tbbproxy: mkdir
+	$(MAKE) -C "$(work_dir)_debug"  -r -f $(tbb_root)/build/Makefile.tbbproxy cfg=debug tbbproxy
 	$(MAKE) -C "$(work_dir)_release"  -r -f $(tbb_root)/build/Makefile.tbbproxy cfg=release tbbproxy
 
 tbbbind: mkdir
+	$(MAKE) -C "$(work_dir)_debug"  -r -f $(tbb_root)/build/Makefile.tbbbind cfg=debug tbbbind
 	$(MAKE) -C "$(work_dir)_release"  -r -f $(tbb_root)/build/Makefile.tbbbind cfg=release tbbbind
 
 test: tbb tbbmalloc $(if $(use_proxy),tbbproxy)
@@ -42,6 +46,7 @@
 	-$(MAKE) -C "$(work_dir)_release"  -r -f $(tbb_root)/build/Makefile.test cfg=release
 
 rml: mkdir
+	$(MAKE) -C "$(work_dir)_debug"  -r -f $(tbb_root)/build/Makefile.rml cfg=debug
 	$(MAKE) -C "$(work_dir)_release"  -r -f $(tbb_root)/build/Makefile.rml cfg=release
 
 examples: tbb tbbmalloc
@@ -64,6 +69,7 @@
 	$(shell $(MAKE) -s -i -r -C examples -f Makefile tbb_root=.. clean >$(NUL) 2>$(NUL))
 
 mkdir:
+	$(shell $(MD) "$(work_dir)_debug" >$(NUL) 2>$(NUL))
 	$(shell $(MD) "$(work_dir)_release" >$(NUL) 2>$(NUL))
 	@echo Created the $(work_dir)_release directory