Since https://trac.sagemath.org/ticket/32789 there is 

+       AC_MSG_CHECKING([that Singular's help is working])
+       AS_IF([test x`echo "help;" | Singular 2>&1 | grep "error\ 
occurred"` = x], [
+        AC_MSG_RESULT(yes)

in singular/spkg-configure.m4.  And on Gentoo "help;" opens the help info 
window.
On Sunday, February 20, 2022 at 10:24:41 AM UTC-7 Steven Trogdon wrote:

>
> When upgrading incrementally from 9.6.beta1 to 9.6.beta2, I have at this 
> point in the configure:
>
> configure:43107: checking that Singular's help is working
> configure:43112: result: yes
>
> a Singular help (info) window is opened and the configure stops until the 
> window is closed. A new configure feature? System singular is being used.
> On Sunday, February 20, 2022 at 7:30:42 AM UTC-7 Volker Braun wrote:
>
>> As always, you can get the latest beta version from the "develop" git 
>> branch. Alternatively, the self-contained source tarball is at 
>> http://www.sagemath.org/download-latest.html
>>
>> 15c8011dd0 (tag: 9.6.beta2, trac/develop) Updated SageMath version to 
>> 9.6.beta2
>> 27c056c587 Trac #33330: Conda: Add primecountpy
>> 5488d2adc0 Trac #33313: schur functions construct elements with 
>> coefficients in the wrong base ring
>> 694cf6915f Trac #33293: checking doctest output is too slow
>> bb991b3133 Trac #33287: make iter(ZZ^n) useful
>> 1c7e26ebdf Trac #33279: Put derivations over function fields in the 
>> framework of RingDerivation
>> ffa81bb454 Trac #33267: Improve speed of sum_of_* for 
>> CombinatorialFreeModule
>> b8c915a480 Trac #33261: .complement() treats bipartite graphs as generic
>> f37bdbfa2e Trac #33237: membership testing for ideals of quotient rings
>> a80605276e Trac #33171: fix and activate pycodestyle E713
>> 0aac3238bf Trac #33000: Remove some imports from sage.rings.all
>> 0f65e48e01 Trac #32789: Fix spkg-configure.m4 for singular
>> 537d9a8e7e Trac #31320: Coercion issue with Laurent polynomial rings
>> 15f2fed8a7 Trac #30695: Padic slice method fails on exact zeros for 
>> certain inputs
>> ff40ba0043 Trac #12595: Add doctest for eigenmatrix of complex 
>> floating-point matrix
>> e4f9347fa4 Trac #33350: remove traces of six
>> 24f0f4eeca Trac #33339: Use latest dev docker build for documentation 
>> workflow
>> 03d78e2ff6 Trac #32966: tox / GH Actions: Add ubuntu variants using 
>> ppa:ubuntu-toolchain-r
>> 22221ae2bb Trac #33174: Unreachable code in sage/graphs/base/c_graph.pyx
>> ddd2ab1e85 Trac #33163: various lgtm suggestions
>> 83c2a60a36 Trac #33133: Add pictures to scatter_plot documentation
>> 44fb492b48 Trac #33115: Re-run bootstrap when an install-requires.txt or 
>> package-version.txt has changed
>> 1dda73e985 Trac #33110: Some performance improvements in the manifolds 
>> code
>> f6aff898e1 Trac #33035: random doctest failure in 
>> src/sage/tests/book_stein_ent.py
>> 69ea2e5159 Trac #32988: Deprecate sage.structure.graphics_file
>> 91710c39f7 Trac #32912: Add pictures to disk.py
>> f413b85fc5 Trac #32264: Convenience syntax for quaternion ideals
>> 92dea6ac0a Trac #31758: State global i or I is a number field element 
>> (and no longer in the symbolic ring)
>> e8c27b5fb6 Trac #31005: Add traceback information to exceptions during 
>> docbuild
>> cd31b18f04 Trac #30763: improve setting global options to None
>> 8b63606d29 Trac #24279: Remove the experimental code for 
>> `RelativeFiniteFieldExtension`
>> 44cd8f8580 Trac #33324: pycodestyle cleaning in discrete Fourier 
>> transforms
>> 5791dba147 Trac #33314: pycodestyle cleanup of phc interface
>> 708efc2b48 Trac #33307: Fix empty section display on prerequisites doc 
>> page
>> 9a9c821782 Trac #33302: fpylll might not find system-wide fplll's 
>> strategies json
>> c10d7bb3d7 Trac #33301: pycodestyle formatting in sage_docbuild
>> 90ec7681c2 Trac #33298: pycodestyle cleaning in rings/valuations/
>> edad8daffc Trac #33297: some details in src/bin scripts
>> 01e86774fe Trac #33278: Adapt Macaulay2 interface doctests to Macaulay2 
>> 1.19
>> d026799042 Trac #33275: Bug fixes for finitely presented graded modules 
>> (#32505)
>> 2e1f8d27ec Trac #33264: Define `x` as symbolic variable in many `animate` 
>> examples
>> 5bdf5dd19a Trac #33263: Add github action running on each push
>> 959ff7a3df Trac #33306: tox.ini: Linux platform updates
>> 10a3cd92d1 Trac #33260: Fix bug in .perfect_matchings() for BipartiteGraph
>> 20684fe0d6 Trac #33257: fix a bug in multiple zeta values
>> 8326dee9e8 Trac #33256: buffer.py: make files readonly only when possible
>> 7f8b2684ba Trac #33123: Move construction methods to Polyhedron_base5
>> 826061adbb (tag: 9.6.beta1) Updated SageMath version to 9.6.beta1
>>
>

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