Why is Guile unable to find libtool?

Bruce Korb <[email protected]>
Newsgroups gmane.lisp.guile.devel,gmane.comp.gnu.libtool.general
Message-ID <CAKRnqNJ6-NF8ODC-YEB9xvKk6bq-9Ja8G4y9sjDiC9RgqQ9-rQ@mail.gmail.com>
 $ ./configure
.........
checking for libltdl... no
configure: error: GNU libltdl (Libtool) not found, see README.
 $ type libtool
bash: type: libtool: not found
 $ sudo apt install libtool
Reading package lists... Done
Building dependency tree
Reading state information... Done
libtool is already the newest version (2.4.6-2).
0 upgraded, 0 newly installed, 0 to remove and 230 not upgraded.
 $ sudo apt install libtool-devel
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package libtool-devel
 $ type libtool
bash: type: libtool: not found
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