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-rw-r--r--pkgs/development/libraries/libwebsockets/default.nix5
1 files changed, 4 insertions, 1 deletions
diff --git a/pkgs/development/libraries/libwebsockets/default.nix b/pkgs/development/libraries/libwebsockets/default.nix
index 15bf77d2fc6..faf6acd40b9 100644
--- a/pkgs/development/libraries/libwebsockets/default.nix
+++ b/pkgs/development/libraries/libwebsockets/default.nix
@@ -5,6 +5,8 @@
 , openssl
 , zlib
 , libuv
+# External poll is required for e.g. mosquitto, but discouraged by the maintainer.
+, withExternalPoll ? false
 }:
 
 let
@@ -29,7 +31,8 @@ let
       "-DLWS_WITH_SOCKS5=ON"
       # Required since v4.2.0
       "-DLWS_BUILD_HASH=no_hash"
-    ] ++ lib.optional (stdenv.hostPlatform != stdenv.buildPlatform) "-DLWS_WITHOUT_TESTAPPS=ON";
+    ] ++ lib.optional (stdenv.hostPlatform != stdenv.buildPlatform) "-DLWS_WITHOUT_TESTAPPS=ON"
+      ++ lib.optional withExternalPoll "-DLWS_WITH_EXTERNAL_POLL=ON";
 
     NIX_CFLAGS_COMPILE = lib.optionalString stdenv.cc.isGNU "-Wno-error=unused-but-set-variable";