MAKEFLAGS option can be used to specify additional options for make. Users with multi-core/multi-processor systems can specify the number of jobs to run simultaneously. This can be accomplished with the use of
nproc to determine the number of available processors, e.g.
-j4 (where 4 is the output of
nproc). Some PKGBUILD's specifically override this with
-j1, because of race conditions in certain versions or simply because it is not supported in the first place. Packages that fail to build because of this should be reported on the bug tracker after making sure that the error is indeed being caused by your MAKEFLAGS.