Works around a niminst bug. Related to commit 3813af63f5 and #4831.

tools/niminst/buildsh.tmpl

@@ -92,6 +92,7 @@ case $uos in
     ;;
   *haiku* )
     myos="haiku"
+    LINK_FLAGS="$LINK_FLAGS -lroot -lnetwork"
     ;;
   *)
     echo 2>&1 "Error: unknown operating system: $uos"

tools/niminst/niminst.nim

@@ -447,7 +447,8 @@ proc readCFiles(c: var ConfigData, osA, cpuA: int) =
           # HACK: we conditionally add ``-lm -ldl``, so remove them from the
           # linker flags:
           c.linker.flags = c.linker.flags.replaceWord("-lm").replaceWord(
-                           "-ldl").strip
+                           "-ldl").replaceWord("-lroot").replaceWord(
+                           "-lnetwork").strip
         else:
           if cmpIgnoreStyle(k.key, "libpath") == 0:
             c.libpath = k.value