There is no fortran 2003 support for MPI2.

diff --git a/src/makefiles/Makefile.xlf2003_mpi_O2 b/src/makefiles/Makefile.xlf2003_mpi_O2
deleted file mode 100644
index 21df5f1..0000000
--- a/src/makefiles/Makefile.xlf2003_mpi_O2
+++ /dev/null
@@ -1,45 +0,0 @@
-#-*- mode: makefile -*-
-#-----------------------------------------------------------------------
-#                  IBM Fortran Compiler + MPI
-#-----------------------------------------------------------------------
-#+ This file is part of the AENET package.
-#+
-#+ Copyright (C) 2012-2016 Nongnuch Artrith and Alexander Urban
-#+
-#+ This program is free software: you can redistribute it and/or modify
-#+ it under the terms of the GNU General Public License as published by
-#+ the Free Software Foundation, either version 3 of the License, or
-#+ (at your option) any later version.
-#+
-#+ This program is distributed in the hope that it will be useful, but
-#+ WITHOUT ANY WARRANTY; without even the implied warranty of
-#+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-#+ General Public License for more details.
-#+
-#+ You should have received a copy of the GNU General Public License
-#+ along with this program.  If not, see <http://www.gnu.org/licenses/>.
-#-----------------------------------------------------------------------
-# 2015-05-26 Alexander Urban (AU) and Nongnuch Artrith (NA)
-#-----------------------------------------------------------------------
-
-SUFFIX   = xlf2003_mpi_O2
-
-FC       = mpif90 -c
-LD       = mpif90
-DEBUG    = # -g -warn all -check bounds
-FCFLAGS  = -compiler xlf2003_r -DPARALLEL -O2 -g -q64 -qarch=pwr7 -qtune=pwr7 $(DEBUG)
-LDFLAGS  = $(DEBUG)
-NUMLIB   = -L$(SCINET_LAPACK_LIB) -q64 -lessl -llapack -lrefblas
-
-CC       = xlc_r -c
-CCFLAGS  =
-
-# linker for C-interoperable library (gcc & gfortran)
-LIBLD    = xlc_r
-LIBFLAGS = -qmkshrobj
-LIBLIB   =
-
-AR       = ar
-ARFLAGS  = -crusv
-
-include ./Makefile.inc