aptitude search gsl-dev - najpierw musiałem zainstalować "aptitude" i teraz komenda
wypisała:

p libghc-hmatrix-gsl-dev - numerical computation
v libghc-hmatrix-gsl-dev-0.19.0.1-7c8 -
p libgsl-dev - GNU Scientific Library (GSL) -- development
p
p libmsgsl-dev - Microsoft Guidelines Support Library

> Najpierw:
>
> sudo apt-get update
>
> Potem reszta. Wszystkie apt-get muszą iśc przez sudo, zwykły user nie ma
> dostępu do instalacji pakietów systemowych.

sudo apt-get update się udało. Teraz zrobiłem sudo apt install libgsl-dev. Udało się,
chyba:

Reading package lists... Done
Building dependency tree
Reading state information... Done
The following additional packages will be installed:
libgsl23 libgslcblas0
Suggested packages:
gsl-ref-psdoc | gsl-doc-pdf | gsl-doc-info | gsl-ref-html
The following NEW packages will be installed:
libgsl-dev libgsl23 libgslcblas0
0 upgraded, 3 newly installed, 0 to remove and 46 not upgraded.
Need to get 1998 kB of archives.
After this operation, 9931 kB of additional disk space will be used.
Do you want to continue? [Y/n] y
Get:1 http://archive.ubuntu.com/ubuntu focal/universe amd64 libgslcblas0 amd64
2.5+dfsg-6build1 [84.6 kB]
Get:2 http://archive.ubuntu.com/ubuntu focal/universe amd64 libgsl23 amd64
2.5+dfsg-6build1 [850 kB]
Get:3 http://archive.ubuntu.com/ubuntu focal/universe amd64 libgsl-dev amd64
2.5+dfsg-6build1 [1064 kB]
Fetched 1998 kB in 2s (948 kB/s)
Selecting previously unselected package libgslcblas0:amd64.
(Reading database ... 32686 files and directories currently installed.)
Preparing to unpack .../libgslcblas0_2.5+dfsg-6build1_amd64.deb ...
Unpacking libgslcblas0:amd64 (2.5+dfsg-6build1) ...
Selecting previously unselected package libgsl23:amd64.
Preparing to unpack .../libgsl23_2.5+dfsg-6build1_amd64.deb ...
Unpacking libgsl23:amd64 (2.5+dfsg-6build1) ...
Selecting previously unselected package libgsl-dev.
Preparing to unpack .../libgsl-dev_2.5+dfsg-6build1_amd64.deb ...
Unpacking libgsl-dev (2.5+dfsg-6build1) ...
Setting up libgslcblas0:amd64 (2.5+dfsg-6build1) ...
Setting up libgsl23:amd64 (2.5+dfsg-6build1) ...
Setting up libgsl-dev (2.5+dfsg-6build1) ...
Processing triggers for man-db (2.9.1-1) ...
Processing triggers for libc-bin (2.31-0ubuntu9) ...

I teraz "autoreconf --force --install", jeśli dokładnie tak miałem wpisać, daje:

configure.ac:89: error: possibly undefined macro: AC_PROG_LIBTOOL
If this token and others are legitimate, please use m4_pattern_allow.
See the Autoconf documentation.
autoreconf: /usr/bin/autoconf failed with exit status: 1