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-rw-r--r--pkgs/servers/mail/archiveopteryx/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/servers/mail/archiveopteryx/default.nix b/pkgs/servers/mail/archiveopteryx/default.nix
index 2bcd87c3b84..0b7a1573fe4 100644
--- a/pkgs/servers/mail/archiveopteryx/default.nix
+++ b/pkgs/servers/mail/archiveopteryx/default.nix
@@ -21,7 +21,7 @@ stdenv.mkDerivation rec {
   '';
 
   # fix build on gcc7+ and gcc11+
-  NIX_CFLAGS_COMPILE = [
+  NIX_CFLAGS_COMPILE = toString [
     "-std=c++11" # c++17+ has errors
     "-Wno-error=builtin-declaration-mismatch"
     "-Wno-error=deprecated-copy"