--- qsampler/trunk/configure.ac	2015/08/14 23:40:53	2835
+++ qsampler/trunk/configure.ac	2016/02/24 16:30:27	2861
@@ -1,5 +1,5 @@
 # Process this file with autoconf to produce a configure script.
-AC_INIT(Qsampler, 0.3.1.3, rncbc@rncbc.org, qsampler)
+AC_INIT(Qsampler, 0.3.1.14, rncbc@rncbc.org, qsampler)
 
 AC_CONFIG_SRCDIR(src/qsampler.cpp)
 AC_CONFIG_HEADERS(src/config.h)
@@ -9,7 +9,7 @@
 AC_PREFIX_DEFAULT(/usr/local)
 ac_prefix=$prefix
 if test "x$ac_prefix" = "xNONE"; then
-    ac_prefix=$ac_default_prefix
+   ac_prefix=$ac_default_prefix
 fi
 AC_SUBST(ac_prefix)
 AC_DEFINE_UNQUOTED(CONFIG_PREFIX, ["$ac_prefix"], [Default installation prefix.])
@@ -49,6 +49,12 @@
   [ac_libgig="$enableval"],
   [ac_libgig="yes"])
 
+# Enable X11 unique/single instance.
+AC_ARG_ENABLE(xunique,
+  AC_HELP_STRING([--enable-xunique], [enable X11 unique/single instance (default=yes)]),
+  [ac_xunique="$enableval"],
+  [ac_xunique="yes"])
+
 # Enable debugger stack-trace option (assumes --enable-debug).
 AC_ARG_ENABLE(stacktrace,
   AC_HELP_STRING([--enable-stacktrace], [enable debugger stack-trace (default=no)]),
@@ -207,7 +213,7 @@
 if test "x$ac_qt4" = "xyes"; then
    AC_CACHE_CHECK([for Qt library version >= 4.4],
       ac_cv_qtversion, [
-      AC_TRY_LINK([#include "QtCore/qglobal.h"], [
+      AC_TRY_COMPILE([#include "QtCore/qglobal.h"], [
          #if QT_VERSION < 0x040400 || QT_VERSION >= 0x050000
          #error Qt library 4.4 or greater required.
          #endif
@@ -221,7 +227,7 @@
 if test "x$ac_qt5" = "xyes"; then
    AC_CACHE_CHECK([for Qt library version >= 5.1],
       ac_cv_qtversion, [
-      AC_TRY_LINK([#include "QtCore/qglobal.h"], [
+      AC_TRY_COMPILE([#include "QtCore/qglobal.h"], [
          #if QT_VERSION < 0x050100 || QT_VERSION >= 0x060000
          #error Qt library 5.1 or greater required.
          #endif
@@ -418,6 +424,11 @@
    AC_DEFINE(CONFIG_ROUND, 1, [Define if round is available.])
 fi
 
+# Check for X11 unique/single instance.
+if test "x$ac_xunique" = "xyes"; then
+   AC_DEFINE(CONFIG_XUNIQUE, 1, [Define if X11 unique/single instance is enabled.])
+fi
+
 # Check for debugging stack-trace.
 if test "x$ac_stacktrace" = "xyes"; then
    AC_DEFINE(CONFIG_STACKTRACE, 1, [Define if debugger stack-trace is enabled.])
@@ -486,6 +497,7 @@
 echo "  LSCP device MIDI event support . . . . . . . . . .: $ac_device_midi_event"
 echo "  LSCP runtime max. voices / disk streams support  .: $ac_max_voices"
 echo
+echo "  X11 Unique/Single instance . . . . . . . . . . . .: $ac_xunique"
 echo "  Debugger stack-trace (gdb) . . . . . . . . . . . .: $ac_stacktrace"
 echo
 echo "  Install prefix . . . . . . . . . . . . . . . . . .: $ac_prefix"