[MacPorts] #25507: kdelibs4 4.4.x fails to compile/link: undefined symbols "_png_set_longjmp_fn"

[Ryan Schmidt]

On Jul 9, 2010, at 18:12, Dan Ports wrote:

> On Fri, Jul 09, 2010 at 05:38:51PM -0500, Ryan Schmidt wrote:
>> I once suggested it would be a good idea to replace the "use_parallel_build" yes/no switch with a more fine-grained switch (say "parallel_jobs") where you could specify the maximum number of parallel jobs. "parallel_jobs 1" would then be the equivalent of today's "use_parallel_build no", "parallel_jobs 0" could be the equivalent of today's "use_parallel_build yes" (mirrors the way "buildmakejobs" works in macports.conf today), and for example "parallel_jobs 2" could be used for ports that support 2 parallel jobs but not more. But for now we don't have this, so software must either support any arbitrary number of parallel jobs, or not be run in parallel at all.
> 
> Are there actually programs that will build with 2 parallel jobs but
> fail with more? (for arbitrary values of 2, of course)


I believe I've encountered a few, yes.