qtconfig.h header not found

Hello Michael,

Following d68fc8d10da9047534f0e7a2d5ebc59f13745442 (configure: try to 
fail early if qt5 header QtCore/qconfig-32.h missing),

I get this:

configure: error: qconfig.h header not found.
Error running configure at ./autogen.sh line 299

Here's my autogen.input:

CC=clang
CXX=clang++
--enable-compiler-plugins
--with-system-odbc
--enable-gtk3-kde5
--enable-kf5
--enable-split-debug
--enable-gdb-index
--enable-ld=gold
--enable-ext-nlpsolver
--enable-ext-ct2n
--enable-ext-numbertext
--enable-postgresql-sdbc
--enable-ext-wiki-publisher
--enable-dbus
--enable-werror
--enable-debug
--enable-dbgutil
--enable-dependency-tracking
--enable-online-update
--enable-python=fully-internal
--without-system-mariadb
--enable-bundle-mariadb
--enable-avahi
--enable-eot
--enable-odk
--with-lang=en-US it fr fi de es br pt pt-BR ru cs hu pl nl el ko ja sl
#--with-lang=ALL
--with-myspell-dicts
--enable-evolution2
#--with-help

apt-file search qconfig.h ->
libsquirrel-dev: /usr/include/squirrel3/sqconfig.h
qtbase5-dev: /usr/include/x86_64-linux-gnu/qt5/QtCore/qconfig.h
qtbase5-gles-dev: /usr/include/x86_64-linux-gnu/qt5/QtCore/qconfig.h

"qtbase5-dev" is installed

julien@debianamd:~/lo/libreoffice$ ls -l 
/usr/include/x86_64-linux-gnu/qt5/QtCore/qconfig.h
-rw-r--r-- 1 root root 1724 juin  26 18:47 
/usr/include/x86_64-linux-gnu/qt5/QtCore/qconfig.h

uname -a -> Linux debianamd 5.7.0-1-amd64 #1 SMP Debian 5.7.6-1 
(2020-06-24) x86_64 GNU/Linux

I must recognize I don't understand why QtCore/qconfig.h isn't found.

What can I check?

Regards,

Julien