diff --git a/pkgs/os-specific/bsd/freebsd/pkgs/libcxxrt.nix b/pkgs/os-specific/bsd/freebsd/pkgs/libcxxrt.nix
new file mode 100644
index 0000000000000..0640d2292d491
--- /dev/null
+++ b/pkgs/os-specific/bsd/freebsd/pkgs/libcxxrt.nix
@@ -0,0 +1,11 @@
+{ mkDerivation, ... }:
+# this package is quite different from stock libcxxrt.
+# as of FreeBSD 14.0, it is vendored from APPROXIMATELY libcxxrt
+# 5d8a15823a103bbc27f1bfdcf2b5aa008fab57dd, though the vendoring mechanism is
+# extremely ad-hoc. Moreover, the build mechanism is totally custom, and adds
+# symbol versions not specified on any version of libcxxrt.
+mkDerivation {
+  pname = "libcxxrt";
+  path = "lib/libcxxrt";
+  extraPaths = [ "contrib/libcxxrt" ];
+}