Fix Makefiles when it comes to bench and examples.

examples/euler001/Makefile

@@ -6,11 +6,15 @@ ifeq ($(BENCH),yes)
   WHY3SHARE=../../share
 else
   WHY3=$(BINDIR)/why3
-  WHY3SHARE=$(shell $WHY3 --print-datadir)
+  WHY3SHARE=$(shell $(WHY3) --print-datadir)
 endif
 
 include $(WHY3SHARE)/Makefile.config
 
+ifeq ($(BENCH),yes)
+  INCLUDE += -I ../../lib/why3
+endif
+
 MAIN=main
 OBJ=euler001__Euler001
 

examples/sudoku/Makefile

@@ -6,11 +6,15 @@ ifeq ($(BENCH),yes)
   WHY3SHARE=../../share
 else
   WHY3=$(BINDIR)/why3
-  WHY3SHARE=$(shell $WHY3 --print-datadir)
+  WHY3SHARE=$(shell $(WHY3) --print-datadir)
 endif
 
 include $(WHY3SHARE)/Makefile.config
 
+ifeq ($(BENCH),yes)
+  INCLUDE += -I ../../lib/why3
+endif
+
 MAIN = main
 OBJ = sudoku__Grid sudoku__TheClassicalSudokuGrid sudoku__Solver
 

examples/vstte10_max_sum/Makefile

@@ -6,11 +6,15 @@ ifeq ($(BENCH),yes)
   WHY3SHARE=../../share
 else
   WHY3=$(BINDIR)/why3
-  WHY3SHARE=$(shell $WHY3 --print-datadir)
+  WHY3SHARE=$(shell $(WHY3) --print-datadir)
 endif
 
 include $(WHY3SHARE)/Makefile.config
 
+ifeq ($(BENCH),yes)
+  INCLUDE += -I ../../lib/why3
+endif
+
 MAIN=main
 OBJ=vstte10_max_sum__MaxAndSum2 vstte10_max_sum__TestCase