Add note about needing pkg-config

I didn't have it and it took me a bit to figure out what the problem was.
2017-02-19 15:02:31 -06:00 · 2017-02-19 15:02:31 -06:00 · 3266e143ce
parent 710a30bb40
commit 3266e143ce
1 changed files with 3 additions and 1 deletions
--- a/README.md
+++ b/README.md
@ -21,7 +21,9 @@ below.

 On Linux, you can typically install OpenSSL via your package manager. The
 headers are sometimes provided in a separate package than the runtime libraries
- look for something like `openssl-devel` or `libssl-dev`.
+- look for something like `openssl-devel` or `libssl-dev`. You will also need the
+regular development utilities, like `pkg-config`, as the custom build script relies 
+on them.

 ```bash
 # On Ubuntu