@clyring the bytestring bump (https://gitlab.haskell.org/ghc/ghc/-/commit/43578d60bfc478e7277dcd892463cec305400025) causes my build to fail with: ``` from libraries/bytestring/cbits/is-valid-utf8.c:53:0: error: /nix/store/llmhxawhz6c4jqgjapbmsmz02579js0s-ghc-9.6.2-with-packages/lib/ghc-9.6.2/lib/x86_64-linux-ghc-9.6.2/rts-1.0.2/include/rts/OSThreads.h:38:5: error: error: unknown type name ‘clockid_t’ 38 | clockid_t timeout_clk; | ^~~~~~~~~ | 38 | clockid_t timeout_clk; | ^ `cc' failed in phase `C Compiler'. (Exit code: 1) ``` I can reproduce this on a clean build following the steps on ghc.dev: ``` git clone --recurse-submodules https://gitlab.haskell.org/ghc/ghc.git git clone https://github.com/alpmestan/ghc.nix nix develop ghc.nix cd ghc ./boot && ./configure hadrian/build -j ``` @alanz also reported seeing this issue on #ghc