UserWarning: FontConfig: No fonts configured.

[izanf]

I'm having this error when I try to use the weasyprint

/usr/local/lib/python3.6/site-packages/weasyprint/fonts.py:230: UserWarning: FontConfig: No fonts configured. Expect ugly output.
  'FontConfig: No fonts configured. '
/usr/local/lib/python3.6/site-packages/weasyprint/document.py:36: UserWarning: There are known rendering problems and missing features with cairo < 1.15.4. WeasyPrint may work with older versions, but please read the note about the needed cairo version on the "Install" page of the documentation before reporting bugs. http://weasyprint.readthedocs.io/en/latest/install.html

and the rendering:

[izanf]

I resolve installing font-config on Alpine Linux

[EricLewe]

I got squares (and the warning) despite having fontconfig installed. This was due to me not having any fonts installed. Hence it was resolved once I added fonts to my OS. (This came in handy for me https://stackoverflow.com/questions/56937689/alpine-linux-fonts)

[yashvarshney003]

Any idea how to resolve for macos?

[fungss]

I resolve installing font-config on Alpine Linux

For those who don't know how to install font-config in a docker container, I managed to solve the problem by adding the followings in the Dockerfile.

RUN apk --update --upgrade --no-cache add fontconfig ttf-freefont font-noto terminus-font \ 
   && fc-cache -f \ 
   && fc-list | sort 

reference: orzih/mkdocs-with-pdf#50

[realFranco]

Based on the @fungss answer.

For alpine:3.20.0 this was solve installing the next "fonts".

# Docker syntax.
RUN apk update --no-cache && \
    apk add --no-cache
        # weasyprint=62.1-r0 \
        # Add fonts.
        fontconfig=2.15.0-r1 \
        # ttf-freefont \
        font-noto=23.7.1-r0
        # terminus-font

For my purposes, I have to use aarch64 architecture, maybe the comented font packages are available but not the previous defined architecture.