Reference "check" build dependency and autogen.sh

README

@@ -38,6 +38,8 @@ Ezstream depends on:
  * TagLib 1.x (1.4 or newer recommended, will be used via the libtag_c
    wrapper)
    (https://taglib.github.io/)
+ * Check Unit testing framework for C
+   (https://libcheck.github.io/check)
 
 Ezstream optionally uses:
  - For basic non-ASCII charset support in metadata and filenames:
@@ -115,6 +117,9 @@ necessary, it is possible to further customize many build flags through
 environment variables. See the "influential environment variables" list
 in the --help output.
 
+To bootstrap a fresh checkout from source control, run the `autogen.sh`
+script.
+
 
 
 USAGE