theabraham/chex — pull request #1 by gavinwahl (2012-11-14 18:30:55+00:00)
Title: Some bug fixes

Two things in this patchest:

- `ishexnumber` doesn't come with linux, so add a definition
- define `_POSIX_SOURCE` so that we get a signature for `kill()`
- Fix a segfault when opening the file fails