### Steps to reproduce the issue ```console $ spack install expect ... configure: error: could not find source file 'pty_.c' ``` ### Information on your system * **Spack:** 0.15.4-1827-dcd514c321 * **Python:** 3.8.6 * **Platform:** darwin-catalina-ivybridge ### Additional information * [spack-build-out.txt](https://github.com/spack/spack/files/5497786/spack-build-out.txt) * [spack-build-env.txt](https://github.com/spack/spack/files/5497788/spack-build-env.txt) Seems related to http://expect.sourceforge.net/FAQ.html#q42 Don't see any special hacks in https://github.com/Homebrew/homebrew-core/blob/master/Formula/expect.rb ### General information - [x] I have run `spack debug report` and reported the version of Spack/Python/Platform - [x] I have run `spack maintainers <name-of-the-package>` and @mentioned any maintainers - [x] I have uploaded the build log and environment files - [x] I have searched the issues of this repo and believe this is not a duplicate
Steps to reproduce the issue
Information on your system
Additional information
Seems related to http://expect.sourceforge.net/FAQ.html#q42
Don't see any special hacks in https://github.com/Homebrew/homebrew-core/blob/master/Formula/expect.rb
General information
spack debug reportand reported the version of Spack/Python/Platformspack maintainers <name-of-the-package>and @mentioned any maintainers