diff --git a/pkgs/servers/dns/knot-dns/default.nix b/pkgs/servers/dns/knot-dns/default.nix
index 0b556a0859c8..1df36cd37c7b 100644
--- a/pkgs/servers/dns/knot-dns/default.nix
+++ b/pkgs/servers/dns/knot-dns/default.nix
@@ -20,17 +20,13 @@ stdenv.mkDerivation rec {
   buildInputs = [
     gnutls jansson liburcu libidn
     nettle libedit
-    libiconv
+    libiconv lmdb
     # without sphinx &al. for developer documentation
   ]
-    # Use embedded lmdb there for now, as detection is broken on Darwin somehow.
-    ++ optionals stdenv.isLinux [ libcap_ng systemd lmdb ]
+    ++ optionals stdenv.isLinux [ libcap_ng systemd ]
     ++ libintlOrEmpty
     ++ optional stdenv.isDarwin zlib; # perhaps due to gnutls
 
-  # Not ideal but seems to work on Linux.
-  configureFlags = optional stdenv.isLinux "--with-lmdb=${stdenv.lib.getLib lmdb}";
-
   enableParallelBuilding = true;
 
   CFLAGS = [ "-O2" "-DNDEBUG" ];
diff --git a/pkgs/servers/dns/knot-resolver/default.nix b/pkgs/servers/dns/knot-resolver/default.nix
index 6130550917e6..44c8b933400e 100644
--- a/pkgs/servers/dns/knot-resolver/default.nix
+++ b/pkgs/servers/dns/knot-resolver/default.nix
@@ -24,8 +24,7 @@ stdenv.mkDerivation rec {
   nativeBuildInputs = [ pkgconfig which makeWrapper hexdump ];
 
   # http://knot-resolver.readthedocs.io/en/latest/build.html#requirements
-  buildInputs = [ knot-dns luajit libuv gnutls nettle ]
-    ++ optional stdenv.isLinux lmdb # system lmdb causes some problems on Darwin
+  buildInputs = [ knot-dns luajit libuv gnutls nettle lmdb ]
     ++ optional doInstallCheck cmocka
     ++ optional stdenv.isLinux systemd # sd_notify
     ++ optionals extraFeatures [