Follow-up Comment #11, bug #66143 (group groff): So, I now installed a debian bookworm distribution in a VM and checked: pkg-config is behaving the same on that system:
grep -IR UCHARDET_CFLAGS Makefile
UCHARDET_CFLAGS = -I/usr/include/uchardet
preconv_CPPFLAGS = $(AM_CPPFLAGS) $(UCHARDET_CFLAGS)
But, I think, that the build is working currently is a coincidence, as
uchardet.h is installed under /usr/include/uchardet/; with /usr/include being
a default search path (correct?).
To test my assumption, I applied my "patch" (removing the 'uchardet' directory
prefix from the include statement) to the current sources and rebuilt on
debian and it still worked just fine.
This suggests, in my interpretation at least, that the pkg-config provided
CFLAGS is not used during a default build currently at all.
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