partially revert previous commit

tests/Makefile.am

@@ -32,7 +32,7 @@ NVCCFLAGS += -I$(top_srcdir)/include/
 	$(MKDIR_P) `dirname $@`
 	$(NVCC) -cubin $< -o $@ --compiler-options -fno-strict-aliasing  $(NVCCFLAGS)
 
-.cu.cuo:
+.cu.o:
 	$(NVCC) $< -c -o $@ --compiler-options -fno-strict-aliasing  $(NVCCFLAGS) -I${includedir}
 
 endif

tests/microbenchs/sync_and_notify_data.c

@@ -16,6 +16,7 @@
 
 #include <stdio.h>
 #include <unistd.h>
+#include <errno.h>
 #include <starpu.h>
 
 #ifdef USE_GORDON