Xorg [1] filed a request to merge libpthread_workqueue-libpthread [2] into libpthread_workqueue-git [3]: libpthread_workqueue-libpthread[1] was originally created to build gnustep-corebase-clang-svn[2], but [1] is to old to compile [2]. Now, gnustep-corebase-clang-svn[2] depends of libpthread_workqueue-git[3]. You can merge [1] on [3], or delete [1] (as you wish). Thank in advance. [1] https://aur.archlinux.org/packages/libpthread_workqueue-libpthread/ [2] https://aur.archlinux.org/packages/gnustep-corebase-clang-svn/ [3] https://aur.archlinux.org/packages/libpthread_workqueue-git/ [1] https://aur.archlinux.org/account/Xorg/ [2] https://aur.archlinux.org/pkgbase/libpthread_workqueue-libpthread/ [3] https://aur.archlinux.org/pkgbase/libpthread_workqueue-git/