Ninja : Unknown IO error - Ubuntu 22.04

raphy@raohy:~/gtkmm-4.8.0$ meson setup --prefix /usr --libdir lib your_builddir .
The Meson build system
Version: 1.3.0
Source dir: /home/raphy/gtkmm-4.8.0
Build dir: /home/raphy/gtkmm-4.8.0/your_builddir

For size limits I’ve put the entire output of meson setup --prefix /usr --libdir lib your_builddir . command in google drive : MesonSetupExecutionOutput.txt - Google Drive

Execuing ninja got this error:

raphy@raohy:~/gtkmm-4.8.0/your_builddir$ ninja
[125/2744] Generating subprojects/libsigcplusplus/docs/docs/manual/manual_html with a custom command
FAILED: subprojects/libsigcplusplus/docs/docs/manual/html 
/usr/bin/python3 /home/raphy/gtkmm-4.8.0/subprojects/libsigcplusplus/tools/ html ../subprojects/libsigcplusplus/docs/docs/manual/libsigc_manual.xml subprojects/libsigcplusplus/docs/docs/manual/html
error : Unknown IO error
warning: failed to load external entity ""
cannot parse
[134/2744] Generating subprojects/libsigcplusplus/docs/docs/reference/html_and_tag with a custom command
ninja: build stopped: subcommand failed.

How to make it work?

Install the docbook5-xml and docbook-xsl packages.

See issue libsigcplusplus#101

Thank you. This solved that issue

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