> Could you please find a more elegant solution ? Thanks in advance.

See e.g. setting of EXTRA_GCC_FLAGS in Makefile.tpl for a way to handle that:
EXTRA_GCC_FLAGS = \
[...]
        "`echo 'LANGUAGES=$(LANGUAGES)' | sed -e s'/[^=][^=]*=$$/XFOO=/'`" \

Arno

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