I think this is the right place to log this, if not, my apologies. When building shared-mime-info, I get the following error:

--[begin output dump]
*** Building shared-mime-info *** [55/70]
make -j 9
  GEN      create-pot
  ITMRG  freedesktop.org.xml
  CC       update_mime_database-update-mime-database.o
Making check in .
  CC       update_mime_database-update-mime-database.o
  CC       test_subclassing-test-subclassing.o
  CC       test_tree_magic-test-tree-magic.o
  ITMRG  freedesktop.org.xml
make[1]: `shared-mime-info.pot' is up to date.
  CCLD     test-subclassing
update-mime-database.c:968:6: warning: implicit declaration of function 'fdatasync' is invalid in C99 [-Wimplicit-function-declaration]
        if (fdatasync(fd) == -1)
            ^
update-mime-database.c:968:6: warning: implicit declaration of function 'fdatasync' is invalid in C99 [-Wimplicit-function-declaration]
        if (fdatasync(fd) == -1)
            ^
1 warning generated.
1 warning generated.
  CCLD     test-tree-magic
mv: rename .deps/update_mime_database-update-mime-database.Tpo to .deps/update_mime_database-update-mime-database.Po: No such file or directory
make[1]: *** [update_mime_database-update-mime-database.o] Error 1
make[1]: *** Waiting for unfinished jobs....
  CCLD     update-mime-database
make: *** [check-recursive] Error 1
make: *** Waiting for unfinished jobs....
*** Error during phase build of shared-mime-info: ########## Error running make -j 9  *** [55/70]

  [1] Rerun phase build
  [2] Ignore error and continue to install
  [3] Give up on module
  [4] Start shell
  [5] Reload configuration
  [6] Go to phase "wipe directory and start over"
  [7] Go to phase "configure"
  [8] Go to phase "clean"
  [9] Go to phase "distclean"
choice:
--[end output dump]--

If I drop to shell and try with parallel building disabled:

> make clean
> make -j 1

the build succeeds.