diff --git a/flake.nix b/flake.nix
index f62c1a8..8547c60 100644
--- a/flake.nix
+++ b/flake.nix
@@ -39,19 +39,28 @@
           cddl = final.callPackage ./pkgs/cddl { };
          });
 
-         tools = (final: prev: {
+         musl = (final: prev: prev.lib.optionalAttrs prev.stdenv.hostPlatform.isMusl {
+           # Fix the following Ruby cross build error:
+           #
+           #     error: output '/nix/store/6hyyk9wnnxpd5rsr6ivc0s8l1lgvsjrb-ruby-x86_64-unknown-linux-musl-3.3.4'
+           #     is not allowed to refer to the following paths:
+           #             /nix/store/c77wdd4fb0llq37bpmfr73m7s7r1j068-ruby-3.3.4
+           #
+           # See https://github.com/NixOS/nixpkgs/issues/347758
            ruby = prev.ruby.overrideAttrs (old: {
-             # Fix the following error on musl64 Ruby:
-             #
-             #     error: output '/nix/store/6hyyk9wnnxpd5rsr6ivc0s8l1lgvsjrb-ruby-x86_64-unknown-linux-musl-3.3.4'
-             #     is not allowed to refer to the following paths:
-             #             /nix/store/c77wdd4fb0llq37bpmfr73m7s7r1j068-ruby-3.3.4
-             #
-             # See https://github.com/NixOS/nixpkgs/issues/347758
              postInstall = old.postInstall + ''
                find $out/${old.passthru.gemPath} -name exts.mk -delete
              '';
            });
+
+           # Tests on static postgresql are failing with:
+           #
+           #    FATAL:  could not load library "/build/postgresql-16.4/.../lib/dict_snowball.so":
+           #    Error relocating /build/postgresql-16.4/tmp_install/nix/store/.../lib/dict_snowball.so:
+           #    pg_any_to_server: symbol not found
+           postgresql = prev.postgresql.overrideAttrs (_: {
+             doCheck = false;
+           });
          });
        };
        supportedSystems = [