diff --git a/Makefile b/Makefile
index e0f7b944..96d73625 100644
--- a/Makefile
+++ b/Makefile
@@ -95,12 +95,13 @@ CXXFLAGS       ?= $(EXTRA_CFLAGS) $(EXTRA_CXXFLAGS)
 CXXFLAGS       += '-I$(MAKEFILE_DIR)/include'
 CXXFLAGS       += '-DFLOX_PKGDB_VERSION="$(VERSION)"'
 LDFLAGS        ?= $(EXTRA_LDFLAGS)
-lib_CXXFLAGS   ?= -shared -fPIC
 ifeq (Linux,$(OS))
-lib_LDFLAGS  ?= -shared -fPIC -Wl,--no-undefined
+SHARED = -shared
 else
-lib_LDFLAGS  ?= -shared -fPIC -Wl,-undefined,error
+SHARED =
 endif
+lib_CXXFLAGS ?= $(SHARED) -fPIC
+lib_LDFLAGS  ?= $(SHARED) -fPIC -Wl,-undefined,error
 bin_CXXFLAGS ?=
 bin_LDFLAGS  ?=
 
diff --git a/flake.nix b/flake.nix
index 641a510b..36ebe416 100644
--- a/flake.nix
+++ b/flake.nix
@@ -92,6 +92,11 @@
         ] ++ nixpkgs.lib.optionals pkgsFor.stdenv.isLinux [
           # For debugging
           pkgsFor.valgrind
+        ] ++ nixpkgs.lib.optionals (
+          ( pkgsFor.stdenv.hostPlatform.useLLVM or false ) ||
+          ( pkgsFor.stdenv.hostPlatform.isDarwin or false )
+        ) [
+          pkgsFor.clang_16
         ];
         inherit (pkgsFor.flox-pkgdb)
           nix_INCDIR boost_CFLAGS libExt SEMVER_PATH