diff --git a/config/nim.cfg b/config/nim.cfg
index 6a259321fb..26948ba928 100644
--- a/config/nim.cfg
+++ b/config/nim.cfg
@@ -134,11 +134,11 @@ nimblepath="$home/.nimble/pkgs/"
     # BSD got posix_spawn only recently, so we deactivate it for osproc:
     define:useFork
   @elif haiku:
-    gcc.options.linker = "-Wl,--as-needed -lnetwork"
-    gcc.cpp.options.linker = "-Wl,--as-needed -lnetwork"
-    clang.options.linker = "-Wl,--as-needed -lnetwork"
-    clang.cpp.options.linker = "-Wl,--as-needed -lnetwork"
-    tcc.options.linker = "-Wl,--as-needed -lnetwork"
+    gcc.options.linker = "-Wl,--as-needed -lnetwork -lbsd"
+    gcc.cpp.options.linker = "-Wl,--as-needed -lnetwork -lbsd"
+    clang.options.linker = "-Wl,--as-needed -lnetwork -lbsd"
+    clang.cpp.options.linker = "-Wl,--as-needed -lnetwork -lbsd"
+    tcc.options.linker = "-Wl,--as-needed -lnetwork -lbsd"
   @elif not genode:
     # -fopenmp
     gcc.options.linker = "-ldl"
diff --git a/lib/posix/kqueue.nim b/lib/posix/kqueue.nim
index 2450cdb424..f5edcaf2e0 100644
--- a/lib/posix/kqueue.nim
+++ b/lib/posix/kqueue.nim
@@ -28,6 +28,15 @@ elif defined(netbsd):
     EVFILT_PROC*     = 4 ## attached to struct proc
     EVFILT_SIGNAL*   = 5 ## attached to struct proc
     EVFILT_TIMER*    = 6 ## timers (in ms)
+elif defined(haiku):
+  const
+    EVFILT_READ*     = -1
+    EVFILT_WRITE*    = -2
+    EVFILT_AIO*      = -3 ## attached to aio requests
+    EVFILT_VNODE*    = -4 ## attached to vnodes
+    EVFILT_PROC*     = -5 ## attached to struct proc
+    EVFILT_SIGNAL*   = -6 ## attached to struct proc
+    EVFILT_TIMER*    = -7 ## timers
 when defined(macosx):
   const
     EVFILT_MACHPORT* = -8  ## Mach portsets