* Experimental feature: allow a derivation to tell the build hook that

  it requires a certain feature on the build machine, e.g.

    requiredSystemFeatures = [ "kvm" ];

  We need this in Hydra to make sure that builds that require KVM
  support are forwarded to machines that have KVM support.  Probably
  this should also be enforced for local builds.

1 files changed, 5 insertions, 0 deletions

diff --git a/src/libutil/util.hh b/src/libutil/util.hh
index c45ebc062ffa..27ad46904958 100644
--- a/src/libutil/util.hh
+++ b/src/libutil/util.hh
@@ -280,6 +280,11 @@ MakeError(Interrupted, BaseError)
 Strings tokenizeString(const string & s, const string & separators = " \t\n\r");
 
 
+/* Concatenate the given strings with a separator between the
+   elements. */
+string concatStringsSep(const string & sep, const Strings & ss);
+
+
 /* Convert the exit status of a child as returned by wait() into an
    error string. */
 string statusToString(int status);