diff -Naur orig.meterbridge-0.9.3/configure.in meterbridge-0.9.3/configure.in
--- orig.meterbridge-0.9.3/configure.in	2019-01-24 17:00:49.573488552 -0800
+++ meterbridge-0.9.3/configure.in	2019-01-24 17:01:49.105270619 -0800
@@ -9,6 +9,7 @@
 # Checks for libraries.
 AC_CHECK_LIB([pthread], [pthread_self], , [AC_MSG_ERROR(You need libpthread installed)])
 AC_CHECK_LIB([m], [sqrt], , [AC_MSG_ERROR(Can't find libm)])
+AC_CHECK_LIB([X11], [XInitThreads], , [AC_MSG_ERROR(You need Xlib instaled)])
 
 # Checks for packages.
 AM_PATH_SDL(1.2.0, , AC_MSG_ERROR([Requires SDL 1.2 or later]))
diff -Naur orig.meterbridge-0.9.3/src/main.c meterbridge-0.9.3/src/main.c
--- orig.meterbridge-0.9.3/src/main.c	2019-01-24 17:00:49.573488552 -0800
+++ meterbridge-0.9.3/src/main.c	2019-01-24 17:02:23.251050690 -0800
@@ -10,6 +10,7 @@
 #include <GL/gl.h>
 #include <jack/jack.h>
 #include <getopt.h>
+#include <X11/Xlib.h>
 
 #include "config.h"
 #include "main.h"
@@ -68,6 +69,7 @@
     meter_t meter_type = MET_PPM;
     char window_name[256];
     char *us_client_name = NULL;
+    XInitThreads();
 
     num_meters = argc;
     while ((opt = getopt(argc, argv, "t:r:c:n:g:h")) != -1) {