Use MPI compiler/linker flags where needed.

src/Makefile.am

-AM_CPPFLAGS = -I../include -I$(srcdir)/../include
+AM_CPPFLAGS = -I../include -I$(srcdir)/../include $(MPI_C_INCLUDE)
 AM_FCFLAGS  = $(MPI_FC_INCLUDE)
-lib_LIBRARIES = libyaxt.a 
+lib_LIBRARIES = libyaxt.a
 
 libyaxt_a_SOURCES =						\
 	xt_handles.c						\

tests/Makefile.am

@@ -38,16 +38,19 @@ test_xmap_dist_dir_SOURCES = test_xmap_dist_dir.c tests.h
 test_xmap_dist_dir_parallel_SOURCES = test_xmap_dist_dir_parallel.c tests.h
 test_handles_SOURCES = test_handles.c tests.h
 test_ut_SOURCES = test_ut.f90
-test_ut_LDADD = $(LDADD) $(MPI_FC_LIB)
+test_ut_LDADD = ../src/libyaxt.a $(MPI_FC_LIB)
 test_perf_SOURCES = test_perf.f90
+test_perf_LDADD = ../src/libyaxt.a $(MPI_FC_LIB)
 test_perf_stripes_SOURCES = test_perf_stripes.f90
+test_perf_stripes_LDADD = ../src/libyaxt.a $(MPI_FC_LIB)
 test_sort_SOURCES = test_sort.c tests.h
 test_yaxt_SOURCES = test_yaxt.f90
+test_yaxt_LDADD = ../src/libyaxt.a $(MPI_FC_LIB)
 test_mpi_generate_datatype_SOURCES = test_mpi_generate_datatype.c tests.h
 
-AM_CFLAGS = -I$(top_srcdir)/src
-AM_FCFLAGS = -I$(top_srcdir)/src -I../src $(MPI_FC_INCLUDE)
-LDADD = ../src/libyaxt.a
+AM_CFLAGS = -I$(top_srcdir)/src $(MPI_C_INCLUDE)
+AM_FCFLAGS = -I$(top_srcdir)/src -I../src $(MPI_FC_INCLUDE) $(MPI_FC_MOD)
+LDADD = ../src/libyaxt.a $(MPI_C_LIB)
 
 TESTS = 							\
 	test_mpi_generate_datatype_run				\