Ensure that the libevent headers are installed for external libevent when --with-devel-headers is given. Correct the path for opal_config.h in the external hwloc header

opal/mca/event/external/Makefile.am

@@ -1,6 +1,7 @@
 #
 # Copyright (c) 2011-2012 Cisco Systems, Inc.  All rights reserved.
 # Copyright (c) 2013      Los Alamos National Security, LLC.  All rights reserved.
+# Copyright (c) 2016      Intel, Inc.  All rights reserved.
 # $COPYRIGHT$
 #
 # Additional copyrights may follow
@@ -16,3 +17,9 @@ libmca_event_external_la_SOURCES = \
         event_external_component.c \
         event_external_module.c
 libmca_event_external_la_CPPFLAGS = $(opal_event_external_CPPFLAGS)
+
+#Conditionally install the header files
+if WANT_INSTALL_HEADERS
+opaldir = $(opalincludedir)/$(subdir)
+nobase_opal_HEADERS = external.h
+endif

opal/mca/hwloc/external/external.h

@@ -3,6 +3,7 @@
  * Copyright (c) 2016      Research Organization for Information Science
  *                         and Technology (RIST). All rights reserved.
  *
+ * Copyright (c) 2016      Intel, Inc.  All rights reserved.
  * $COPYRIGHT$
  *
  * Additional copyrights may follow
@@ -19,7 +20,7 @@
 
 BEGIN_C_DECLS
 
-#include <opal/include/opal_config.h>
+#include <opal_config.h>
 #include MCA_hwloc_external_header
 
 /* If the including file requested it, also include the hwloc verbs