Per http://www.open-mpi.org/community/lists/devel/2014/01/13938.php,

Orion Poplawski noticed that we should not be installing mpio.h.

cmr=v1.7.4:reviewer=hjelmn:subject=do not install mpio.h

This commit was SVN r30465.

ompi/mca/io/romio/romio/Makefile.am

@@ -64,7 +64,8 @@ AM_CPPFLAGS += $(MPI_H_INCLUDE)
 # handle the "include" directory here
 AM_CPPFLAGS += -I$(top_builddir)/include -I$(top_srcdir)/include
 # nodist_ b/c these are created by config.status and should not be distributed
-nodist_include_HEADERS += include/mpio.h
+# Open MPI: do not install mpio.h
+noinst_HEADERS += include/mpio.h
 noinst_HEADERS += include/io_romio_conv.h
 
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