diff --git a/opal/mca/hwloc/Makefile.am b/opal/mca/hwloc/Makefile.am
index 9a12052746c..c5340da386d 100644
--- a/opal/mca/hwloc/Makefile.am
+++ b/opal/mca/hwloc/Makefile.am
@@ -1,5 +1,7 @@
 #
-# Copyright (c) 2011      Cisco Systems, Inc.  All rights reserved.
+# Copyright (c) 2011-2016 Cisco Systems, Inc.  All rights reserved.
+# Copyright (c) 2016      Research Organization for Information Science
+#                         and Technology (RIST). All rights reserved.
 # $COPYRIGHT$
 #
 # Additional copyrights may follow
@@ -7,6 +9,11 @@
 # $HEADER$
 #
 
+# We do not want -I$(srcdir) in AM_CPPFLAGS, or there can be a
+# conflict between system hwloc.h and opal/mca/hwloc/hwloc.h.  So just
+# set only what we need to AM_CPPFLAGS.
+AM_CPPFLAGS = -I$(top_builddir)/opal/include
+
 # main library setup
 noinst_LTLIBRARIES = libmca_hwloc.la
 libmca_hwloc_la_SOURCES =
diff --git a/opal/mca/hwloc/external/configure.m4 b/opal/mca/hwloc/external/configure.m4
index 31fd1e3c0e9..c9c8a272df2 100644
--- a/opal/mca/hwloc/external/configure.m4
+++ b/opal/mca/hwloc/external/configure.m4
@@ -1,7 +1,7 @@
 # -*- shell-script -*-
 #
 # Copyright (c) 2009-2016 Cisco Systems, Inc.  All rights reserved.
-# Copyright (c) 2014      Research Organization for Information Science
+# Copyright (c) 2014-2016 Research Organization for Information Science
 #                         and Technology (RIST). All rights reserved.
 #
 # $COPYRIGHT$
@@ -61,12 +61,17 @@ AC_DEFUN([MCA_opal_hwloc_external_POST_CONFIG],[
            # OPAL_HWLOC_WANT_VERBS_HELPER is set, that file will
            # include the external hwloc/openfabrics-verbs.h file (via
            # the MCA_hwloc_external_openfabrics_helper define).
+           AS_IF([test "$opal_hwloc_dir" != ""],
+                 [opal_hwloc_include="$opal_hwloc_dir/include/hwloc.h"
+                  opal_hwloc_openfabrics_include="$opal_hwloc_dir/include/hwloc/openfabrics-verbs.h"],
+                 [opal_hwloc_include="hwloc.h"
+                  opal_hwloc_openfabrics_include="hwloc/openfabrics-verbs.h"])
            AC_DEFINE_UNQUOTED(MCA_hwloc_external_header,
-                  ["$opal_hwloc_dir/include/hwloc.h"],
+                  ["$opal_hwloc_include"],
                   [Location of external hwloc header])
            AC_DEFINE_UNQUOTED(MCA_hwloc_external_openfabrics_header,
-                  ["$opal_hwloc_dir/include/hwloc/openfabrics-verbs.h"],
-                  [Location of external hwloc header])
+                  ["$opal_hwloc_openfabrics_include"],
+                  [Location of external hwloc OpenFabrics header])
           ])
     OPAL_VAR_SCOPE_POP
 ])dnl