Use GUIX installed packages / libraries in Guile

[Zelphir Kaltstahl]

Hi,

A while ago I installed Guix, initially only to be able to install
GNUTLS, to be able to make HTTPS requests with the standard library's
web client procedures http-get and similar.

Now I have Guix and I installed GNUTLS, but Guile does not know where it
is to find GNUTLS. For example the following code will tell me that
GNUTLS is required:

~~~
(use-modules (web client)
             #;(ice-9 receive))

(call-with-values
    (lambda ()
      (http-get "https://duckduckgo.com";
                #:port (open-socket-for-uri "https://duckduckgo.com";)
                #:version '(1 . 1)
                #:keep-alive? #f
                #:headers '()
                #:decode-body? #t
                #:streaming? #f))
  (lambda (response response-text)
    (display response)
    (display response-text)))
~~~

Output:

~~~
(… some backtrace here …)

web/client.scm:105:2: In procedure tls-wrap:
Throw to key `gnutls-not-available' with args `("(gnutls) module not 
available")'.
~~~

I located something at:

/gnu/store/z0g1wsiw2n5d1hspbj7xkhj6vnc2qlvp-gnutls-3.5.18/share/guile/site/2.2/gnutls.scm

Also I found:

~~~
ll /gnu/store/ | grep gnutls
-r--r--r--   2 root root           735 Jan  1  1970 
259dacgq58awd2l8zq7i2p16l7j6a283-gnutls-3.5.18.tar.xz.drv
-r--r--r--   2 root root          2834 Jan  1  1970 
7iajc4kiddris32jdkfn28gykvs25g1w-gnutls-3.5.18.tar.xz-builder
-r--r--r--   2 root root          3656 Jan  1  1970 
csji08kzw1rswy13jm7xk7f0rp130d55-gnutls-3.5.18.drv
-r--r--r--   2 root root          1315 Jan  1  1970 
ivyr33ppfcwkdmkyhk1p6ky7mijanhjj-gnutls-3.5.18.tar.xz.drv
-r--r--r--   2 root root          4414 Jan  1  1970 
kd0x57fwwvqqx8jircvs4bcawxskqzmh-gnutls-3.5.18-guile-builder
-r--r--r--   4 root root           579 Jan  1  1970 
l8ap56kw9nan13lkgrg8v8ayzfrn2gc5-gnutls-skip-trust-store-test.patch
-r--r--r--   4 root root          1008 Jan  1  1970 
sfg2p3l0363yk3s7hrzs1032fl0dga64-gnutls-skip-pkgconfig-test.patch
~~~

For this and other libraries: How do I make Guile automatically use
libraries installed through Guix?


Here is some more technical detail:

- I am using a Xubuntu 18.04 (lsb_release -d: Description:    Ubuntu
18.04.1 LTS)
- Guile version: 2.2.4
- Guix version: 0.16.0 (installed binary distribution using the install
script from the website)
- I have the following in my ~/.bashrc related to Guile and Guix:

~~~
# Guile Scheme Load Path
export GUILE_LOAD_PATH=/home/xiaolong/development/Guile/libs  # (this is where 
I put manually built and installed libraries)
# GNU GUIX locales
export GUIX_LOCPATH="${HOME}/.guix-profile/lib/locale"
export PATH="${HOME}/.guix-profile/bin${PATH:+:}$PATH"
~~~

- I have the following in my ~/.profile relating to Guile / Guix:

~~~
# changes for GNU GUIX
export GUIX_PROFILE="$HOME/.guix-profile"
source "$GUIX_PROFILE/etc/profile"
export GUIX_LOCPATH="$GUIX_PROFILE/lib/locale"
export LC_ALL="en_US.UTF-8"
~~~

Regards,

Zelphir