sage: 9.8 -> 10.0

  singular = pkgs.singular.override { inherit flint; };

  maxima = pkgs.maxima-ecl-5_45.override {

  maxima = pkgs.maxima-ecl.override {

    lisp-compiler = pkgs.ecl.override {

      # "echo syntax error | ecl > /dev/full 2>&1" segfaults in

      # ECL. We apply a patch to fix it (write_error.patch), but it

diff --git a/src/sage/repl/configuration.py b/src/sage/repl/configuration.py

index 67d7d2accf..18279581e2 100644

--- a/src/sage/repl/configuration.py

+++ b/src/sage/repl/configuration.py

@@ -9,10 +9,11 @@ the IPython simple prompt is being used::

     sage: cmd = 'print([sys.stdin.isatty(), sys.stdout.isatty()])'

     sage: import pexpect

     sage: output = pexpect.run(

-    ....:     'bash -c \'echo "{0}" | sage\''.format(cmd),

+    ....:     'bash -c \'export SAGE_BANNER=no; echo "{0}" | sage\''.format(cmd),

     ....: ).decode('utf-8', 'surrogateescape')

-    sage: 'sage: [False, True]' in output

-    True

+    sage: print(output)

+    sage...[False, True]

+    ...

 """

 #*****************************************************************************

diff --git a/src/sage/env.py b/src/sage/env.py

index c4953cfa65..47b880f9ad 100644

--- a/src/sage/env.py

+++ b/src/sage/env.py

@@ -244,81 +244,8 @@ os.environ['MPMATH_SAGE'] = '1'

 SAGE_BANNER = var("SAGE_BANNER", "")

 SAGE_IMPORTALL = var("SAGE_IMPORTALL", "yes")

-

-def _get_shared_lib_path(*libnames: str) -> Optional[str]:

-    """

-    Return the full path to a shared library file installed in

-    ``$SAGE_LOCAL/lib`` or the directories associated with the

-    Python sysconfig.

-

-    This can also be passed more than one library name (e.g. for cases where

-    some library may have multiple names depending on the platform) in which

-    case the first one found is returned.

-

-    This supports most *NIX variants (in which ``lib<libname>.so`` is found

-    under ``$SAGE_LOCAL/lib``), macOS (same, but with the ``.dylib``

-    extension), and Cygwin (under ``$SAGE_LOCAL/bin/cyg<libname>.dll``,

-    or ``$SAGE_LOCAL/bin/cyg<libname>-*.dll`` for versioned DLLs).

-

-    For distributions like Debian that use a multiarch layout, we also try the

-    multiarch lib paths (i.e. ``/usr/lib/<arch>/``).

-

-    This returns ``None`` if no matching library file could be found.

-

-    EXAMPLES::

-

-        sage: from sage.env import _get_shared_lib_path

-        sage: "gap" in _get_shared_lib_path("gap")

-        True

-        sage: _get_shared_lib_path("an_absurd_lib") is None

-        True

-

-    """

-

-    for libname in libnames:

-        search_directories: List[Path] = []

-        patterns: List[str] = []

-        if sys.platform == 'cygwin':

-            # Later down we take the first matching DLL found, so search

-            # SAGE_LOCAL first so that it takes precedence

-            if SAGE_LOCAL:

-                search_directories.append(Path(SAGE_LOCAL) / 'bin')

-            search_directories.append(Path(sysconfig.get_config_var('BINDIR')))

-            # Note: The following is not very robust, since if there are multible

-            # versions for the same library this just selects one more or less

-            # at arbitrary. However, practically speaking, on Cygwin, there

-            # will only ever be one version

-            patterns = [f'cyg{libname}.dll', f'cyg{libname}-*.dll']

-        else:

-            if sys.platform == 'darwin':

-                ext = 'dylib'

-            else:

-                ext = 'so'

-

-            if SAGE_LOCAL:

-                search_directories.append(Path(SAGE_LOCAL) / 'lib')

-            libdir = sysconfig.get_config_var('LIBDIR')

-            if libdir is not None:

-                libdir = Path(libdir)

-                search_directories.append(libdir)

-

-                multiarchlib = sysconfig.get_config_var('MULTIARCH')

-                if multiarchlib is not None:

-                    search_directories.append(libdir / multiarchlib),

-

-            patterns = [f'lib{libname}.{ext}']

-

-        for directory in search_directories:

-            for pattern in patterns:

-                path = next(directory.glob(pattern), None)

-                if path is not None:

-                    return str(path.resolve())

-

-    # Just return None if no files were found

-    return None

-

 # locate libgap shared object

-GAP_SO = var("GAP_SO", _get_shared_lib_path("gap", ""))

+GAP_SO = var("GAP_SO", '/default')

 # post process

 if DOT_SAGE is not None and ' ' in DOT_SAGE:

diff --git a/src/sage/doctest/forker.py b/src/sage/doctest/forker.py

index 02e18e67e7..2ebf6eb35f 100644

--- a/src/sage/doctest/forker.py

+++ b/src/sage/doctest/forker.py

@@ -1075,6 +1075,14 @@ class SageDocTestRunner(doctest.DocTestRunner, object):

             sage: set(ex2.predecessors) == set([ex0,ex1])

             True

         """

+

+        # Fix ECL dir race conditions by using a separate dir for each process

+        # (https://trac.sagemath.org/ticket/26968)

+        os.environ['MAXIMA_USERDIR'] = "{}/sage-maxima-{}".format(

+            tempfile.gettempdir(),

+            os.getpid()

+        )

+

         if isinstance(globs, RecordingDict):

             globs.start()

         example.sequence_number = len(self.history)

diff --git a/src/sage/misc/persist.pyx b/src/sage/misc/persist.pyx

index 3ac5f1cc2b..cb1f327c19 100644

--- a/src/sage/misc/persist.pyx

+++ b/src/sage/misc/persist.pyx

@@ -157,7 +157,7 @@ def load(*filename, compress=True, verbose=True, **kwargs):

         ....:     _ = f.write(code)

         sage: load(t)

         sage: hello

-        <fortran object>

+        <fortran ...>

     """

     import sage.repl.load

     if len(filename) != 1:

diff --git a/src/sage/plot/complex_plot.pyx b/src/sage/plot/complex_plot.pyx

index 6f0aeab87a..b77c69b2f7 100644

--- a/src/sage/plot/complex_plot.pyx

+++ b/src/sage/plot/complex_plot.pyx

@@ -461,6 +461,8 @@ def complex_to_rgb(z_values, contoured=False, tiled=False,

             rgb[i, j, 2] = b

     sig_off()

+    nan_indices = np.isnan(rgb).any(-1)     # Mask for undefined points

+    rgb[nan_indices] = 1                    # Make nan_indices white

     return rgb

diff --git a/src/sage/plot/histogram.py b/src/sage/plot/histogram.py

index 3bc2b76b58..388c2d1391 100644

--- a/src/sage/plot/histogram.py

+++ b/src/sage/plot/histogram.py

@@ -87,13 +87,8 @@ class Histogram(GraphicPrimitive):

         TESTS::

-            sage: h = histogram([10,3,5], normed=True)[0]

-            doctest:warning...:

-            DeprecationWarning: the 'normed' option is deprecated. Use 'density' instead.

-            See https://trac.sagemath.org/25260 for details.

+            sage: h = histogram([10,3,5], density=True)[0]

             sage: h.get_minmax_data()

-            doctest:warning ...

-            ...VisibleDeprecationWarning: Passing `normed=True` on non-uniform bins has always been broken, and computes neither the probability density function nor the probability mass function. The result is only correct if the bins are uniform, when density=True will produce the same result anyway. The argument will be removed in a future version of numpy.

             {'xmax': 10.0, 'xmin': 3.0, 'ymax': 0.476190476190..., 'ymin': 0}

         """

         import numpy

diff --git a/src/sage/repl/ipython_extension.py b/src/sage/repl/ipython_extension.py

index 798671aab4..cad6a47ca8 100644

--- a/src/sage/repl/ipython_extension.py

+++ b/src/sage/repl/ipython_extension.py

@@ -405,7 +405,7 @@ class SageMagics(Magics):

             ....: C END FILE FIB1.F

             ....: ''')

             sage: fib

-            <fortran object>

+            <fortran ...>

             sage: from numpy import array

             sage: a = array(range(10), dtype=float)

             sage: fib(a, 10)