diff --git a/sequencer/wscript b/sequencer/wscript
index b7d3ae3..0b7a28d 100644
--- a/sequencer/wscript
+++ b/sequencer/wscript
@@ -63,7 +63,7 @@ src/transport.C
               target       = 'non-sequencer',
               includes     = ['.', 'src', 'src/gui', '../FL', '../nonlib'],
               use = ['nonlib', 'fl_widgets'],
-              uselib = [ 'JACK', 'SIGCPP', 'LIBLO', 'NTK', 'NTK_IMAGES', 'PTHREAD'],
+              uselib = [ 'JACK', 'SIGCPP', 'LIBLO', 'XLIB', 'NTK', 'NTK_IMAGES', 'PTHREAD'],
               install_path = '${BINDIR}')
 
     bld( features = 'subst',
diff --git a/wscript b/wscript
index b8dd707..ec0946c 100644
--- a/wscript
+++ b/wscript
@@ -57,6 +57,9 @@ def configure(conf):
     conf.check_cfg(package='jack', uselib_store='JACK', args="--cflags --libs",
                    atleast_version='0.103.0', mandatory=True)
 
+    conf.check_cfg(package='x11', uselib_store='XLIB',args="--cflags --libs",
+                      mandatory=True)
+
     conf.check_cfg(package='liblo', uselib_store='LIBLO',args="--cflags --libs",
                       atleast_version='0.26', mandatory=True)