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-rw-r--r--pkgs/development/libraries/olm/default.nix6
1 files changed, 4 insertions, 2 deletions
diff --git a/pkgs/development/libraries/olm/default.nix b/pkgs/development/libraries/olm/default.nix
index 224c01e2c50..8fbdf28965b 100644
--- a/pkgs/development/libraries/olm/default.nix
+++ b/pkgs/development/libraries/olm/default.nix
@@ -15,9 +15,11 @@ stdenv.mkDerivation rec {
   # requires optimisation but memory operations are compiled with -O0
   hardeningDisable = ["fortify"];
 
-  makeFlags = if stdenv.cc.isClang then [ "CC=cc" ] else null;
+  makeFlags = stdenv.lib.optional stdenv.cc.isClang "CC=cc";
 
-  installFlags = "PREFIX=$(out)";
+  installFlags = [
+    "PREFIX=${placeholder ''out''}"
+  ];
 
   meta = {
     description = "Implements double cryptographic ratchet and Megolm ratchet";