building firebird fails without parallelism

[Jean-Baptiste Faure]

Hi,

It seems that the makefile generated to build Firebird in the master
does not like the --without-parallelism option of the autogen.sh. I get
an error message about a -j option of make (actually -j0) which requires
a positive number.
If I replace --without-parallelism by with-parallelism=2 it seems to
work (building in progress) but my machine is not really available to do
something else.

Best regards.
JBF

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