--- xmobar-0.29.4/iwlib-0.1.0/iwlib.cabal~	2018-01-31 07:00:13.000000000 +0800
+++ xmobar-0.29.4/iwlib-0.1.0/iwlib.cabal	2019-03-04 11:24:19.033283194 +0800
@@ -24,5 +24,5 @@
   includes:            iwlib.h
   default-language:    Haskell2010
   exposed-modules:     Network.IWlib
-  extra-libraries:     iw
+  extra-libraries:     iw m
   ghc-options:         -Wall
\ No newline at end of file
--- xmobar-0.29.4/xmobar.cabal~	2019-03-04 11:32:13.826170026 +0800
+++ xmobar-0.29.4/xmobar.cabal	2019-03-04 11:48:38.178168287 +0800
@@ -157,7 +157,7 @@
                    Xmobar.Plugins.Monitors.Bright,
                    Xmobar.Plugins.Monitors.CatInt
 
-    extra-libraries: Xrandr Xrender
+    extra-libraries: Xrandr Xrender m
 
     ghc-options: -funbox-strict-fields -Wall -fno-warn-unused-do-bind