# Build failed with NonZeroExit 77 **URL:** \ **Category:** TidalCycles\ **Tags:** installation\ **Created:** [22 May 2020 19:57 UTC](https://uzu.lurk.org/t/build-failed-with-nonzeroexit-77/1124 "2020-05-22T19:57:09Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![Lindsay\_Corstorphine](https://uzu.lurk.org/user_avatar/uzu.lurk.org/lindsay_corstorphine/32/585_2.png) [@Lindsay\_Corstorphine](https://uzu.lurk.org/u/Lindsay_Corstorphine)\ **Post date:** [22 May 2020 19:57 UTC](https://uzu.lurk.org/t/build-failed-with-nonzeroexit-77/1124/1 "2020-05-22T19:57:10Z")
hello - i'm picking up Tidal Cycles again after a bit of break. I went to reinstall the 'easy' mac package and keep getting this - **[Info]** verifying digest of: ghc-8.8.3-x86\_64-apple-darwin.tar.xz **[Info]** Unpacking: ghc-8.8.3-x86\_64-apple-darwin.tar.xz to /var/folders/xn/d82x46vn6\_x3bnx7gmmt18h40000gn/T/ghcup-IoNrBZ **[Info]** Installing GHC (this may take a while) [ghc-configure] not found (too old?) [ghc-configure] checking for gcc... gcc [ghc-configure] checking whether the C compiler works... no [ghc-configure] configure: error: in `/private/var/folders/xn/d82x46vn6\_x3... [ghc-configure] configure: error: C compiler cannot create executables [ghc-configure] See `config.log' for more details **[Error]** Build failed with NonZeroExit 77 "./configure" ["--prefix=/Users/LindsayCorstorphine/.ghcup/ghc/8.8.3"] "ghcup --cache install" failed! What does it mean and what do I do from here?! Help! Thanks! Lindsay ---
**Author:** ![yaxu](https://uzu.lurk.org/user_avatar/uzu.lurk.org/yaxu/32/2_2.png) [@yaxu](https://uzu.lurk.org/u/yaxu)\ **Post date:** [22 May 2020 20:00 UTC](https://uzu.lurk.org/t/build-failed-with-nonzeroexit-77/1124/2 "2020-05-22T20:00:41Z")
Hi @Lindsay_Corstorphine, Hm it's having problems compiling some library from source code. Maybe the compiler is missing. What happens when you run this in a terminal window: ```shell xcode-select --install ```