libredirect: Use extensions.sharedLibrary

This is to make sure we get the correct shared library suffix of the
target platform. While for example on Darwin it would even work with the
hardcoded .so prefix it's IMHO a bit nicer to have the actual native
extension.

Signed-off-by: aszlig <aszlig@nix.build>

1 files changed, 7 insertions, 2 deletions

diff --git a/pkgs/build-support/libredirect/default.nix b/pkgs/build-support/libredirect/default.nix
index d3de805b2f92b..fec659ff5fda9 100644
--- a/pkgs/build-support/libredirect/default.nix
+++ b/pkgs/build-support/libredirect/default.nix
@@ -5,11 +5,16 @@ stdenv.mkDerivation {
 
   unpackPhase = "cp ${./libredirect.c} libredirect.c";
 
+  shlibext = stdenv.targetPlatform.extensions.sharedLibrary;
+
   buildPhase = ''
-    $CC -Wall -std=c99 -O3 -shared libredirect.c -o libredirect.so -fPIC -ldl
+    $CC -Wall -std=c99 -O3 -shared libredirect.c \
+      -o "libredirect$shlibext" -fPIC -ldl
   '';
 
-  installPhase = "mkdir -p $out/lib; cp libredirect.so $out/lib";
+  installPhase = ''
+    install -vD "libredirect$shlibext" "$out/lib/libredirect$shlibext"
+  '';
 
   meta = {
     platforms = stdenv.lib.platforms.unix;