ollvm-tapir.0.99.1 requires autoconf

[emillon]

In #24007:

#=== ERROR while compiling ollvm-tapir.0.99.1 =================================#
# context              2.2.0~alpha~dev | linux/x86_64 | ocaml-base-compiler.4.14.1 | file:///home/opam/opam-repository
# path                 ~/.opam/4.14/.opam-switch/build/ollvm-tapir.0.99.1
# command              ~/.opam/opam-init/hooks/sandbox.sh build make
# exit-code            2
# env-file             ~/.opam/log/ollvm-tapir-6-365ad5.env
# output-file          ~/.opam/log/ollvm-tapir-6-365ad5.out
### output ###
# CDPATH="${ZSH_VERSION+.}:" && cd . && /bin/bash /home/opam/.opam/4.14/.opam-switch/build/ollvm-tapir.0.99.1/missing autoconf
# /home/opam/.opam/4.14/.opam-switch/build/ollvm-tapir.0.99.1/missing: line 81: autoconf: command not found
# WARNING: 'autoconf' is missing on your system.
#          You should only need it if you modified 'configure.ac',
#          or m4 files included by it.
#          The 'autoconf' program is part of the GNU Autoconf package:
#          <http://www.gnu.org/software/autoconf/>
#          It also requires GNU m4 and Perl in order to run:
#          <http://www.gnu.org/software/m4/>
#          <http://www.perl.org/>
# make: *** [Makefile:268: configure] Error 127

[mseri]

Thanks