prefer <istream>, <ostream>, or <iosfwd> to <iostream> where possible Using <iostream> brings with it a static initializer for the std::cin, std::cout, and std::cerr streams. In most cases they are not needed and should be avoided if possible. Files affected: build-aux/mk-opts.pl libgui/qterminal/libqterminal/win32/QWinTerminalImpl.cpp libinterp/corefcn/__dsearchn__.cc libinterp/corefcn/c-file-ptr-stream.cc libinterp/corefcn/c-file-ptr-stream.h libinterp/corefcn/daspk.cc libinterp/corefcn/dasrt.cc libinterp/corefcn/dassl.cc libinterp/corefcn/defaults.cc libinterp/corefcn/defun.cc libinterp/corefcn/file-io.cc libinterp/corefcn/ft-text-renderer.cc libinterp/corefcn/gl-render.cc libinterp/corefcn/help.cc libinterp/corefcn/ls-ascii-helper.cc libinterp/corefcn/ls-hdf5.cc libinterp/corefcn/ls-hdf5.h libinterp/corefcn/ls-mat-ascii.cc libinterp/corefcn/ls-mat4.cc libinterp/corefcn/ls-mat5.cc libinterp/corefcn/ls-oct-binary.cc libinterp/corefcn/ls-oct-text.cc libinterp/corefcn/lsode.cc libinterp/corefcn/oct-iostrm.cc libinterp/corefcn/oct-procbuf.cc libinterp/corefcn/oct-stdstrm.h libinterp/corefcn/procstream.cc libinterp/corefcn/procstream.h libinterp/corefcn/quad.cc libinterp/corefcn/symscope.h libinterp/corefcn/symtab.h libinterp/corefcn/toplev.cc libinterp/corefcn/urlwrite.cc libinterp/corefcn/utils.cc libinterp/corefcn/zfstream.cc libinterp/dldfcn/__ode15__.cc libinterp/dldfcn/convhulln.cc libinterp/octave-value/ov-base-diag.cc libinterp/octave-value/ov-base-int.cc libinterp/octave-value/ov-base-mat.cc libinterp/octave-value/ov-base-scalar.cc libinterp/octave-value/ov-base-sparse.cc libinterp/octave-value/ov-base.cc libinterp/octave-value/ov-bool-mat.cc libinterp/octave-value/ov-bool-sparse.cc libinterp/octave-value/ov-bool.cc libinterp/octave-value/ov-cell.cc libinterp/octave-value/ov-ch-mat.cc libinterp/octave-value/ov-class.cc libinterp/octave-value/ov-colon.cc libinterp/octave-value/ov-complex.cc libinterp/octave-value/ov-cs-list.cc libinterp/octave-value/ov-cx-mat.cc libinterp/octave-value/ov-cx-sparse.cc libinterp/octave-value/ov-fcn-handle.cc libinterp/octave-value/ov-fcn-inline.cc libinterp/octave-value/ov-float.cc libinterp/octave-value/ov-flt-complex.cc libinterp/octave-value/ov-flt-cx-mat.cc libinterp/octave-value/ov-flt-re-mat.cc libinterp/octave-value/ov-int16.cc libinterp/octave-value/ov-int32.cc libinterp/octave-value/ov-int64.cc libinterp/octave-value/ov-int8.cc libinterp/octave-value/ov-java.cc libinterp/octave-value/ov-range.cc libinterp/octave-value/ov-re-mat.cc libinterp/octave-value/ov-re-sparse.cc libinterp/octave-value/ov-scalar.cc libinterp/octave-value/ov-str-mat.cc libinterp/octave-value/ov-struct.cc libinterp/octave-value/ov-typeinfo.cc libinterp/octave-value/ov-uint16.cc libinterp/octave-value/ov-uint32.cc libinterp/octave-value/ov-uint64.cc libinterp/octave-value/ov-uint8.cc libinterp/octave.cc libinterp/parse-tree/bp-table.cc libinterp/parse-tree/lex.h libinterp/parse-tree/profiler.cc libinterp/parse-tree/pt-arg-list.cc libinterp/parse-tree/pt-array-list.cc libinterp/parse-tree/pt-assign.cc libinterp/parse-tree/pt-cell.cc libinterp/parse-tree/pt-const.cc libinterp/parse-tree/pt-eval.cc libinterp/parse-tree/pt-exp.cc libinterp/parse-tree/pt-fcn-handle.cc libinterp/parse-tree/pt-jit.cc libinterp/parse-tree/pt-pr-code.cc libinterp/parse-tree/pt-tm-const.cc libinterp/parse-tree/pt.cc liboctave/array/Array.cc liboctave/array/CColVector.cc liboctave/array/CDiagMatrix.cc liboctave/array/CMatrix.cc liboctave/array/CNDArray.cc liboctave/array/CRowVector.cc liboctave/array/CSparse.cc liboctave/array/DiagArray2.cc liboctave/array/MArray.cc liboctave/array/Range.cc liboctave/array/Sparse.cc liboctave/array/boolMatrix.cc liboctave/array/boolSparse.cc liboctave/array/chMatrix.cc liboctave/array/dColVector.cc liboctave/array/dDiagMatrix.cc liboctave/array/dMatrix.cc liboctave/array/dNDArray.cc liboctave/array/dRowVector.cc liboctave/array/dSparse.cc liboctave/array/fCColVector.cc liboctave/array/fCDiagMatrix.cc liboctave/array/fCMatrix.cc liboctave/array/fCNDArray.cc liboctave/array/fCRowVector.cc liboctave/array/fColVector.cc liboctave/array/fDiagMatrix.cc liboctave/array/fMatrix.cc liboctave/array/fNDArray.cc liboctave/array/fRowVector.cc liboctave/array/idx-vector.cc liboctave/numeric/CollocWt.cc liboctave/numeric/eigs-base.cc liboctave/system/file-ops.cc liboctave/system/oct-time.cc liboctave/util/cmd-hist.cc liboctave/util/data-conv.cc liboctave/util/data-conv.h liboctave/util/file-info.cc liboctave/util/lo-utils.cc liboctave/util/lo-utils.h liboctave/util/quit.cc liboctave/util/str-vec.cc liboctave/util/url-transfer.cc liboctave/util/url-transfer.h

--- a/libinterp/octave-value/ov-cell.cc	Wed Jun 06 13:13:20 2018 -0400
+++ b/libinterp/octave-value/ov-cell.cc	Thu Jun 07 10:11:54 2018 -0400
@@ -25,8 +25,8 @@
 #  include "config.h"
 #endif
 
-#include <iomanip>
-#include <iostream>
+#include <istream>
+#include <ostream>
 #include <sstream>
 #include <vector>
 #include <queue>