diff --git a/bin/mpienv-init b/bin/mpienv-init
index d1746d4..eb56ea2 100755
--- a/bin/mpienv-init
+++ b/bin/mpienv-init
@@ -45,30 +45,6 @@ function mpienv() {
                 fi
             }
             ;;
-        "configure" )
-            {
-                env PYTHONPATH=$MPIENV_ROOT:${PYTHONPATH:-} \
-                    python -m mpienv.command.configure "$@"
-            }
-            ;;
-        "build" )
-            {
-                env PYTHONPATH=$MPIENV_ROOT:${PYTHONPATH:-} \
-                    python -m mpienv.command.build "$@"
-            }
-            ;;
-        "install" )
-            {
-                env PYTHONPATH=$MPIENV_ROOT:${PYTHONPATH:-} \
-                    python -m mpienv.command.install "$@"
-            }
-            ;;
-        "clean" )
-            {
-                env PYTHONPATH=$MPIENV_ROOT:${PYTHONPATH:-} \
-                    python -m mpienv.command.clean "$@"
-            }
-            ;;
         "add" )
             {
                env PYTHONPATH=$MPIENV_ROOT:${PYTHONPATH:-} \
diff --git a/mpienv/command/build.py b/mpienv/command/build.py
deleted file mode 100644
index 819e215..0000000
--- a/mpienv/command/build.py
+++ /dev/null
@@ -1,34 +0,0 @@
-# coding: utf-8
-
-import argparse
-
-from mpienv.installer import create_installer
-from mpienv import mpienv
-
-
-parser = argparse.ArgumentParser(
-    prog='mpienv build',
-    description='Build a specific MPI package from source.')
-parser.add_argument('-n', '--name', metavar='name', dest='name',
-                    default=None, type=str,
-                    help='Name of an MPI installation')
-parser.add_argument('-v', '--verbose', dest='verbose',
-                    default=False, action='store_true',
-                    help='Verbose')
-parser.add_argument('-j', type=int, default=1, dest='npar',
-                    help="Number of parallel make jobs")
-parser.add_argument('mpi', type=str, metavar="[MPI]",
-                    help='MPI name')
-
-
-def main():
-    args = parser.parse_args()
-
-    inst = create_installer(mpienv, args.mpi, args.name,
-                            verbose=args.verbose)
-
-    inst.build(npar=args.npar)
-
-
-if __name__ == "__main__":
-    main()
diff --git a/mpienv/command/configure.py b/mpienv/command/configure.py
deleted file mode 100644
index 157be26..0000000
--- a/mpienv/command/configure.py
+++ /dev/null
@@ -1,34 +0,0 @@
-# coding: utf-8
-
-import argparse
-
-from mpienv.installer import create_installer
-from mpienv import mpienv
-
-
-parser = argparse.ArgumentParser(
-    prog='mpienv configure',
-    description='Run configure script in a specific MPI package.')
-parser.add_argument('-n', '--name', metavar='name', dest='name',
-                    default=None, type=str, nargs='?',
-                    help='Name of an MPI installation')
-parser.add_argument('-v', '--verbose', dest='verbose',
-                    default=False, action='store_true',
-                    help='Verbose')
-parser.add_argument('mpi', type=str, metavar="[MPI]",
-                    help='MPI name', default=None)
-parser.add_argument('conf_args', nargs=argparse.REMAINDER,
-                    default=[])
-
-
-def main():
-    args = parser.parse_args()
-
-    inst = create_installer(mpienv, args.mpi, args.name,
-                            verbose=args.verbose)
-
-    inst.configure()
-
-
-if __name__ == "__main__":
-    main()
diff --git a/mpienv/command/install.py b/mpienv/command/install.py
deleted file mode 100644
index 9cbc4ed..0000000
--- a/mpienv/command/install.py
+++ /dev/null
@@ -1,41 +0,0 @@
-# coding: utf-8
-
-import argparse
-import sys
-
-from mpienv.installer import create_installer
-from mpienv.installer import list_avail
-from mpienv import mpienv
-
-parser = argparse.ArgumentParser(
-    prog='mpienv build', description='Install a new MPI environment.')
-parser.add_argument('-n', '--name', metavar='name', dest='name',
-                    default=None, type=str,
-                    help='Name of an MPI installation')
-parser.add_argument('-v', '--verbose', dest='verbose',
-                    default=False, action='store_true',
-                    help='Verbose')
-parser.add_argument('-j', type=int, default=1, dest='npar',
-                    help="Number of parallel make jobs")
-parser.add_argument('mpi', type=str, metavar="[MPI]",
-                    help='MPI name')
-
-
-def main():
-    try:
-        if sys.argv[1:].index('--list') >= 0:
-            list_avail()
-            exit(0)
-    except ValueError:
-        pass
-
-    args = parser.parse_args()
-
-    inst = create_installer(mpienv, args.mpi, args.name,
-                            verbose=args.verbose)
-
-    inst.install(npar=args.npar)
-
-
-if __name__ == "__main__":
-    main()
diff --git a/mpienv/installer.py b/mpienv/installer.py
deleted file mode 100644
index c32abd8..0000000
--- a/mpienv/installer.py
+++ /dev/null
@@ -1,225 +0,0 @@
-# coding: utf-8
-
-import json
-import os
-import os.path
-import re
-import shutil
-from subprocess import check_call
-import sys
-
-_ompi_url = ('https://www.open-mpi.org/software/ompi/'
-             'v{}/downloads/openmpi-{}.tar.bz2')
-
-_mpich_url = ('http://www.mpich.org/static/'
-              'downloads/{}/mpich-{}.tar.gz')
-
-_mv_url = ('http://mvapich.cse.ohio-state.edu'
-           '/download/mvapich/mv2/mvapich2-{}.tar.gz')
-
-_list = {
-    'openmpi-1.10.7': {
-        'type': 'openmpi',
-        'ver': '1.10.7',
-        'url': _ompi_url.format('1.10', '1.10.7'),
-    },
-    'openmpi-2.0.3': {
-        'type': 'openmpi',
-        'ver': '2.0.3',
-        'url': _ompi_url.format('2.0', '2.0.3'),
-    },
-    'openmpi-2.1.1': {
-        'type': 'openmpi',
-        'ver': '2.1.1',
-        'url': _ompi_url.format('2.1', '2.1.1'),
-    },
-    'mpich-3.1.4': {
-        'type': 'mpich',
-        'ver': '3.1.4',
-        'url': _mpich_url.format('3.1.4', '3.1.4'),
-    },
-    'mpich-3.2': {
-        'type': 'mpich',
-        'ver': '3.2',
-        'url': _mpich_url.format('3.2', '3.2'),
-    },
-    'mpich-3.3a': {
-        'type': 'mpich',
-        'ver': '3.3a',
-        'url': _mpich_url.format('3.3a', '3.3a'),
-    },
-    'mvapich-2.2': {
-        'type': 'mvapich',
-        'ver': '2.2',
-        'url': _mv_url.format('2.2'),
-    },
-    'mvapich-2.3a': {
-        'type': 'mvapich',
-        'ver': '2.3a',
-        'url': _mv_url.format('2.3a'),
-    },
-}
-
-
-class BaseInstaller(object):
-    def __init__(self, mpienv, mpi, name, verbose):
-        self.mpi = mpi
-        self.mpienv = mpienv
-        self.name = name
-
-        self.url = _list[mpi]['url']
-
-        # Downloaded file name
-        self.local_file = os.path.join(self.mpienv.cache_dir(),
-                                       os.path.basename(self.url))
-
-        # build directory name
-        dir_bname = re.sub(r'(\.tar\.(gz|bz2))|(\.tgz)$',
-                           '',
-                           os.path.basename(self.url))
-
-        self.ext_path = os.path.join(self.mpienv.build_dir(),
-                                     name)
-        self.dir_path = os.path.join(self.ext_path,
-                                     dir_bname)
-
-        self.prefix = os.path.join(mpienv.mpi_dir(), name)
-
-        if not os.path.exists(self.ext_path):
-            os.makedirs(self.ext_path)
-
-    def clean(self):
-        if os.path.exists(self.dir_path):
-            print("Deleting the build directory...")
-            shutil.rmtree(self.dir_path)
-
-    def download(self):
-        # TODO(keisukefukuda): check the checksum
-        if not os.path.exists(self.local_file):
-            with open(self.local_file, 'w') as f:
-                check_call(['curl', self.url], stdout=f)
-
-    def configure(self):
-        self.download()
-        print('Configuring in {}'.format(self.dir_path))
-
-        print("ext_path={}".format(self.ext_path))
-        # Extract the archive files
-        if not os.path.exists(self.dir_path):
-            check_call(['tar', '-xf', self.local_file],
-                       cwd=self.ext_path)
-
-        opts = os.environ.get("MPIENV_CONFIGURE_OPTS")
-        if opts:
-            conf_args = opts.split()
-        else:
-            conf_args = []
-
-        # fix the configure argument
-        try:
-            idx = conf_args.index('--prefix')
-            if idx >= 0:
-                sys.stderr.write("Warning: --prefix argument is "
-                                 "replaced by mpienv\n")
-                # remove --prefix xxxx
-                try:
-                    conf_args[idx:idx + 2] = []
-                except IndexError:
-                    pass
-        except ValueError:
-            # If --prefix is not found
-            pass
-
-        # Check args = --help, or insert our --prefix argument
-        try:
-            idx = conf_args.index('--help')
-            if idx >= 0:
-                conf_args = ['--help']
-        except ValueError:
-            # if --help is not found
-            conf_args += ['--prefix', self.prefix]
-
-        print(' '.join(['./configure'] + conf_args))
-
-        # Check cache
-        cache = os.path.join(self.dir_path, 'mpienv.conf')
-        if os.path.exists(cache):
-            with open(cache, 'r') as f:
-                try:
-                    loaded = json.load(f)
-                    cached = (loaded == conf_args)
-                    print("loaded = {}".format(loaded))
-                    print("conf_args = {}".format(conf_args))
-                except ValueError:
-                    cached = False
-        else:
-            cached = False
-        print("cached = {}".format(cached))
-
-        if cached is False:
-            # run configure scripts
-            assert(os.path.exists(self.dir_path))
-            print(' '.join(['./configure'] + conf_args))
-            check_call(['./configure'] + conf_args,
-                       cwd=self.dir_path)
-            with open(cache, 'w') as f:
-                json.dump(conf_args, f)
-
-    def build(self, npar=1):
-        self.configure()
-        print('Building in {}'.format(self.dir_path))
-        # run make
-        print(' '.join(['make', '-j', str(npar)]))
-        check_call(['make', '-j', str(npar)],
-                   shell=True, cwd=self.dir_path)
-
-    def install(self, npar=1):
-        self.configure()
-        print(' '.join(['make', 'install', '-j', str(npar)]))
-        check_call(['make', 'install', '-j', str(npar)],
-                   cwd=self.dir_path)
-
-
-class OmpiInstaller(BaseInstaller):
-    def __init__(self, *args):
-        BaseInstaller.__init__(self, *args)
-
-
-class MpichInstaller(BaseInstaller):
-    def __init__(self, *args):
-        BaseInstaller.__init__(self, *args)
-
-
-class MvapichInstaller(BaseInstaller):
-    def __init__(self, *args):
-        BaseInstaller.__init__(self, *args)
-
-
-def list_avail():
-    for k in sorted(_list):
-        print(' ' + k)
-
-
-def create_installer(mpienv, mpi, name, verbose):
-    if name in mpienv:
-        sys.stderr.write("Error: MPI name "
-                         "'{}' already exists.\n".format(name))
-        exit(-1)
-
-    if mpi not in _list.keys():
-        sys.stderr.write("Error: Unknown MPI: '{}'\n".format(mpi))
-        exit(-1)
-
-    if name is None:
-        name = mpi
-
-    mpi_type = _list[mpi]['type']
-
-    if mpi_type == 'openmpi':
-        return OmpiInstaller(mpienv, mpi, name, verbose)
-    elif mpi_type == 'mvapich':
-        return MvapichInstaller(mpienv, mpi, name, verbose)
-    elif mpi_type == 'mpich':
-        return MpichInstaller(mpienv, mpi, name, verbose)
-
-    raise RuntimeError("")