How to update PKG_CONFIG_PATH for Guile?

While trying to install chickadee on Ubuntu, I ran ./configure inside the extracted folder and got errors as below:

checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes <>
checking for a thread-safe mkdir -p... /usr/bin/mkdir -p
checking for gawk... no
checking for mawk... mawk
checking whether make sets $(MAKE)... yes
checking whether make supports nested variables... yes
checking whether make supports nested variables... (cached) yes
checking for guile... /usr/bin/guile
checking for pkg-config... /usr/bin/pkg-config
checking pkg-config is at least version 0.9.0... yes
configure: checking for guile 3.0
configure: checking for guile 2.2
configure: error:
No Guile development packages were found.
Please verify that you have Guile installed. If you installed Guile
from a binary distribution, please verify that you have also installed
the development packages. If you installed it yourself, you might need
to adjust your PKG_CONFIG_PATH; see the pkg-config man page for more.

I've already installed Guile-3.0.1 via apt install. I am able to see Guile inside /usr/bin/, but I'm not able to see Guile inside /usr/lib/x86_64-linux-gnu/pkgconfig as mentioned in this answer.

I also tried updating PKG_CONFIG_PATH with the values: /usr/bin/pkg-config and it did not work.

Here is the relevant log from config.log inside the chickadee folder:

~/Downloads/chickadee-0.5.0$ cat config.log | grep pkg
configure:2510: checking for pkg-config
configure:2528: found /usr/bin/pkg-config
configure:2540: result: /usr/bin/pkg-config
configure:2565: checking pkg-config is at least version 0.9.0
Package guile-3.0 was not found in the pkg-config search path.
Package guile-2.2 was not found in the pkg-config search path.
to adjust your PKG_CONFIG_PATH; see the pkg-config man page for more.
ac_cv_path_ac_pt_PKG_CONFIG=/usr/bin/pkg-config
PKG_CONFIG='/usr/bin/pkg-config'

2 Answers

It seems you installed only the application, and not the development libraries, asked for by configure. In your case, try :
sudo apt-get install guile-3.0-dev
What packages are available can be listed by :
apt-cache search guile

A library can use pkg-config to communicate build info to other libraries (location of libraries, compiler flags, ...). This is stored in a .pc file. If this .pc file is not stored in the default pkg-config search path, it is possible to extend the search path of pkg-config.
Find the .pc file yourself, suppose your library is called guile-something, then try e.g.
sudo find / -name "guile*.pc"
Assuming that the pc file is found in e.g. /usr/local/lib/pkgconfig this directory may be added to the pkg-config path by adding the line
export PKG_CONFIG_PATH=/usr/local/lib/pkgconfig
either to ~/.bashrc, then it will be set at every invocation of bash
or to ~/.profile, then it will be set at every login
To list all the libraries currently seen by pkg-config, execute
pkg-config --list-all