diff --git a/katze/wscript_build b/katze/wscript_build
index 128fd357..b52eb015 100644
--- a/katze/wscript_build
+++ b/katze/wscript_build
@@ -9,7 +9,7 @@ obj.name = 'katze'
 obj.target = 'katze'
 obj.includes = '. ../.'
 obj.find_sources_in_dirs ('.')
-obj.uselib = 'GMODULE LIBSOUP GTK LIBXML'
+obj.uselib = 'M GMODULE LIBSOUP GTK LIBXML'
 obj.install_path = None
 
 if platform.architecture ()[0] == '64bit':
diff --git a/wscript b/wscript
index b913591f..f3c23463 100644
--- a/wscript
+++ b/wscript
@@ -149,6 +149,7 @@ def configure (conf):
         sqlite = 'no '
     conf.define ('HAVE_SQLITE', [0,1][sqlite == 'yes'])
 
+    conf.check (lib='m', mandatory=True)
     check_pkg ('gmodule-2.0', '2.8.0', False)
     check_pkg ('gthread-2.0', '2.8.0', False)
     check_pkg ('gio-2.0', '2.16.0', False)