@Dima, thanks, I know that though. Nevertheless, I now started from anew 
(that is I removed the sage directory and git-cloned sage to make sure that 
there are no remains causing trouble). After running configure, the script 
suggests to `sudo pacman -S eclib fflas-ffpack linbox nauty singular`. 
However, all these packages are installed: `pacman -Q eclib fflas-ffpack 
linbox nauty singular` returns
eclib 20240408-1
fflas-ffpack 2.5.0-1
linbox 1.7.0-1
nauty 1:2.8.8-2
singular 4.3.2.p16-1

The possibly relevant snippets of the config.log are

[...]
It was created by Sage configure 10.4.beta3, which was
generated by GNU Autoconf 2.72.  Invocation command line was

  $ ./configure --enable-bliss --enable-cbc --enable-csdp --enable-dsdp 
--enable-gap_p
ackages --enable-libnauty --enable-mcqd --enable-msolve 
--enable-pari_galpol --enable-
scip --enable-scip_sdp --no-create --no-recursion
[...]
hostname = wma7117
uname -m = x86_64
uname -r = 6.8.5-arch1-1
uname -s = Linux
uname -v = #1 SMP PREEMPT_DYNAMIC Thu, 11 Apr 2024 01:47:33 +0000

/usr/bin/uname -p = unknown
/bin/uname -X     = unknown

/bin/arch              = unknown
/usr/bin/arch -k       = unknown
/usr/convex/getsysinfo = unknown
/usr/bin/hostinfo      = unknown
/bin/machine           = unknown
/usr/bin/oslevel       = unknown
/bin/universe          = unknown

PATH: /home/mueller/.codon/bin/
PATH: /home/mueller/.codon/bin/
PATH: /home/mueller/local/copt/bin/
PATH: /usr/local/sbin/
PATH: /usr/local/bin/
PATH: /usr/bin/
PATH: /usr/bin/site_perl/
PATH: /usr/bin/vendor_perl/
PATH: /usr/bin/core_perl/
PATH: /home/mueller/local/bin/
PATH: /home/mueller/Adm/local/bin/
PATH: /home/mueller/local/gurobi/linux64/bin/

and

## Checking whether SageMath should install SPKG singular... ##
## --------------------------------------------------------- ##
configure:49864: checking whether any of gmp ntl flint readline mpfr cddlib 
is installed as or will be installed as SPKG
configure:49869: result: yes; install singular as well
configure:50085: no suitable system package found for SPKG singular

dim...@gmail.com schrieb am Freitag, 19. April 2024 um 12:08:01 UTC+2:

> On Fri, Apr 19, 2024 at 02:28:13AM -0700, 'Peter Mueller' via sage-devel 
> wrote:
> > I just figured out that the installation from source (even with the 
> > explicit configure option `--with-system-singular`) on an up to date 
> arch 
> > linux machine ignores the installed singular (`pacman -Q singular` 
> returns 
> > `singular 4.3.2.p16-1`). Not sure if it is a path problem that makes the 
> > configure script fail to detect the singular installation.
> The 1st thing 1st, 
> if your source install already has singular built, you need to uninstall
> it, for ./configure to pick up the system-wide one.
>
> if you post your config.log we can tell you more on why it goes wrong.
>
> Dima
>
> > 
> > Antonio Rojas schrieb am Donnerstag, 18. April 2024 um 09:03:22 UTC+2:
> > 
> > Works fine with system singular 4.3.2.p16 too, so this may be a bug in 
> that 
> > particular Singular version.
> > 
> > El jueves, 18 de abril de 2024 a las 6:02:53 UTC+2, Kwankyu Lee escribió:
> > 
> > No problem with Singular 4.3.2 included in sage (on mac).
> > 
> > -- 
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>
>

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