# Bug report ### Bug description: # Bug description: The compilation of mimalloc on GNU/Hurd currently fails with the following error: ``` In file included from ../Objects/mimalloc/prim/prim.c:22, from ../Objects/mimalloc/static.c:37: ../Objects/mimalloc/prim/unix/prim.c: In function 'mi_prim_open': ../Objects/mimalloc/prim/unix/prim.c:82:10: error: implicit declaration of function 'open'; did you mean 'popen'? [-Werror=implicit-function-declaration] 82 | return open(fpath,open_flags); | ^~~~ | popen ``` This is already fixed upstream by https://github.com/microsoft/mimalloc/commit/98abfe042cbb168309832b744bbed982d81bba6b . will submit a PR containing a backport # CPython versions tested on: CPython 3.13.0 b3 ### CPython versions tested on: 3.13 ### Operating systems tested on: Other <!-- gh-linked-prs --> ### Linked PRs * gh-121732 * gh-121773 <!-- /gh-linked-prs -->