Parallel build of mail/thunderbird?

[Trond Endrestøl]

Hi,

I've noticed when building mail/thunderbird, the -j flag doesn't 
propagate beyond the first instance of gmake.

Is it impossible to build mail/thunderbird in parallel?

I've noticed this on my VBox guests running stable/{8,9,10} and head, 
running on a VBox host with 4 cores.

As a counter, www/firefox does build in parallel.

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