nbd: re-introduced linking with -lrt, and added an additional -lpthread on top of it

Linking these libraries makes sure that they can be found at run-time,
because a proper rpath into the Nix store is added to the generated
executable. Without that rpath, nbd-server will try to load the system's
libpthread.so.0, which may not be what we want.

svn path=/nixpkgs/trunk/; revision=33408

1 files changed, 5 insertions, 0 deletions

diff --git a/pkgs/tools/networking/nbd/default.nix b/pkgs/tools/networking/nbd/default.nix
index 929db017152..a478fe9454c 100644
--- a/pkgs/tools/networking/nbd/default.nix
+++ b/pkgs/tools/networking/nbd/default.nix
@@ -21,6 +21,11 @@ stdenv.mkDerivation {
   # The test suite doesn't succeed on Hydra.
   doCheck = false;
 
+  # Glib calls `clock_gettime', which is in librt. Linking that library
+  # here ensures that a proper rpath is added to the executable so that
+  # it can be loaded at run-time.
+  NIX_LDFLAGS = "-lrt -lpthread";
+
   meta = {
     homepage = "http://nbd.sourceforge.net";
     description = "map arbitrary files as block devices over the network";