Add main src dir as an include directory

tools/Makefile.am

@@ -17,7 +17,7 @@
 SUBDIRS = 
 
 LIBS = $(top_builddir)/src/libstarpu.la @LIBS@
-AM_CPPFLAGS = -I$(top_srcdir)/include/ -I$(top_srcdir)/tools/ -I$(top_srcdir)/mpi/ -I$(top_builddir)/src
+AM_CPPFLAGS = -I$(top_srcdir)/include/ -I$(top_srcdir)/tools/ -I$(top_srcdir)/mpi/ -I$(top_builddir)/src -I$(top_srcdir)/src
 
 bin_PROGRAMS =