diff --git a/mx.fastr/mx_fastr_dists.py b/mx.fastr/mx_fastr_dists.py
index b04c13428653b42c7fccb2a726c3ea1d49e8835b..6ef478f23a76bab6c5e8e54e394bb66fb5db405d 100644
--- a/mx.fastr/mx_fastr_dists.py
+++ b/mx.fastr/mx_fastr_dists.py
@@ -213,6 +213,12 @@ class FastRArchiveParticipant:
             shutil.rmtree(include_dir)
 
 def mx_post_parse_cmd_line(opts):
+    if os.environ.has_key('FASTR_RFFI'):
+        val = os.environ['FASTR_RFFI']
+    else:
+        val = ""
+    mx.instantiateDistribution('FASTR_RELEASE<rffi>', dict(rffi=val))
+
     for dist in mx_fastr._fastr_suite.dists:
         if isinstance(dist, mx.JARDistribution):
             dist.set_archiveparticipant(FastRArchiveParticipant(dist))
diff --git a/mx.fastr/mx_fastr_junit.py b/mx.fastr/mx_fastr_junit.py
deleted file mode 100644
index 6e7f8f9a031445118c72281efea3fabf8a18c240..0000000000000000000000000000000000000000
--- a/mx.fastr/mx_fastr_junit.py
+++ /dev/null
@@ -1,116 +0,0 @@
-#
-# Copyright (c) 2016, 2017, Oracle and/or its affiliates. All rights reserved.
-# DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
-#
-# This code is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License version 2 only, as
-# published by the Free Software Foundation.
-#
-# This code 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
-# version 2 for more details (a copy is included in the LICENSE file that
-# accompanied this code).
-#
-# You should have received a copy of the GNU General Public License version
-# 2 along with this work; if not, write to the Free Software Foundation,
-# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
-#
-# Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
-# or visit www.oracle.com if you need additional information or have any
-# questions.
-#
-from argparse import ArgumentParser, REMAINDER
-import os, tempfile
-import mx
-import mx_fastr
-
-def junit(args, harness, parser=None, jdk_default=None):
-    """run Junit tests"""
-    suppliedParser = parser is not None
-    parser = parser if suppliedParser else ArgumentParser(prog='mx junit')
-    parser.add_argument('--tests', action='store', help='pattern to match test packages')
-    parser.add_argument('--exclude', action='append', help='test classes to exclude')
-    parser.add_argument('--J', dest='vm_args', action='append', help='target VM arguments (e.g. --J @-dsa)', metavar='@<args>')
-    parser.add_argument('--jdk', action='store', help='jdk to use')
-    if suppliedParser:
-        parser.add_argument('remainder', nargs=REMAINDER, metavar='...')
-    args = parser.parse_args(args)
-
-    vmArgs = ['-ea', '-esa']
-
-    if args.vm_args:
-        vmArgs = vmArgs + mx_fastr.split_j_args(args.vm_args)
-
-    testfile = os.environ.get('MX_TESTFILE', None)
-    if testfile is None:
-        (_, testfile) = tempfile.mkstemp(".testclasses", "mx")
-        os.close(_)
-
-    candidates = []
-    if args.jdk:
-        jdk = mx.get_jdk(tag=args.jdk)
-        if not jdk:
-            mx.abort("jdk '" + args.jdk + "' not found")
-    else:
-        if not jdk_default:
-            jdk = mx.get_jdk()
-        else:
-            jdk = jdk_default
-
-    for p in mx.projects(opt_limit_to_suite=True):
-        if not p.isJavaProject() or jdk.javaCompliance < p.javaCompliance:
-            continue
-        candidates += _find_classes_with_annotations(p, None, ['@Test']).keys()
-
-    tests = [] if args.tests is None else [name for name in args.tests.split(',')]
-    classes = []
-    excluded = args.exclude
-
-    if len(tests) == 0:
-        classes = candidates
-    else:
-        for t in tests:
-            found = False
-            for c in candidates:
-                if excluded:
-                    if c in excluded:
-                        print 'excluding '  + c
-                        continue
-                if t in c:
-                    found = True
-                    classes.append(c)
-            if not found:
-                mx.warn('no tests matched by substring "' + t + '"')
-
-    dists = ['FASTR', 'FASTR_UNIT_TESTS']
-    if mx.suite('r-apptests', fatalIfMissing=False):
-        dists.append('com.oracle.truffle.r.test.apps')
-    if mx_fastr._mx_sulong:
-        dists.append('SULONG')
-    vmArgs += mx.get_runtime_jvm_args(dists, jdk=jdk)
-
-    if len(classes) != 0:
-        if len(classes) == 1:
-            testClassArgs = ['--testclass', classes[0]]
-        else:
-            with open(testfile, 'w') as f:
-                for c in classes:
-                    f.write(c + '\n')
-            testClassArgs = ['--testsfile', testfile]
-        junitArgs = ['com.oracle.truffle.r.test.FastRJUnitWrapper'] + testClassArgs
-        rc = harness(args, vmArgs, jdk, junitArgs)
-        return rc
-    else:
-        return 0
-
-def _find_classes_with_annotations(p, pkgRoot, annotations, includeInnerClasses=False):
-    """
-    Scan the sources of project `p` for Java source files containing a line starting with `annotation`
-    (ignoring preceding whitespace) and return the fully qualified class name for each Java
-    source file matched in a list.
-    """
-
-    matches = lambda line: len([a for a in annotations if line == a or line.startswith(a + '(')]) != 0
-    return p.find_classes_with_matching_source_line(pkgRoot, matches, includeInnerClasses)
-
diff --git a/mx.fastr/suite.py b/mx.fastr/suite.py
index b827db109703e4f0d3f90b9a7b777538a231e719..ebeb6dfaab1b771625f77df69fe9027ffe9b6ddc 100644
--- a/mx.fastr/suite.py
+++ b/mx.fastr/suite.py
@@ -365,30 +365,29 @@ suite = {
      ],
     },
 
-    "FASTR_RELEASE": {
+    "FASTR_RELEASE<rffi>": {
       "description" : "a binary release of FastR",
       "dependencies" : ["com.oracle.truffle.r.release"],
        "os_arch" : {
          "linux" : {
           "amd64" : {
-            "path" : "mxbuild/dists/linux/amd64/fastr-release.jar",
+            "path" : "mxbuild/dists/linux/amd64/<rffi>/fastr-release.jar",
           },
           "sparcv9" : {
-            "path" : "mxbuild/dists/linux/sparcv9/fastr-release.jar",
+            "path" : "mxbuild/dists/linux/sparcv9/<rffi>/fastr-release.jar",
           },
         },
         "darwin" : {
           "amd64" : {
-            "path" : "mxbuild/dists/darwin/amd64/fastr-release.jar",
+            "path" : "mxbuild/dists/darwin/amd64/<rffi>/fastr-release.jar",
           },
         },
         "solaris" : {
           "sparcv9" : {
-            "path" : "mxbuild/dists/solaris/sparcv9/fastr-release.jar",
+            "path" : "mxbuild/dists/solaris/sparcv9/<rffi>/fastr-release.jar",
           },
         },
       },
     },
   },
 }
-