--- qsampler/trunk/configure.ac	2016/10/09 10:14:12	3002
+++ qsampler/trunk/configure.ac	2016/11/04 23:54:44	3037
@@ -1,12 +1,20 @@
 # Process this file with autoconf to produce a configure script.
-AC_INIT(Qsampler, 0.4.1.6, rncbc@rncbc.org, qsampler)
+AC_INIT(Qsampler, 0.4.1.10, rncbc@rncbc.org, qsampler)
 
 AC_CONFIG_SRCDIR(src/qsampler.cpp)
 AC_CONFIG_HEADERS(src/config.h)
 AC_CONFIG_FILES(Makefile qsampler.spec src/src.pri src/qsampler.desktop)
 
+# Build date and time.
+AC_CACHE_VAL([ac_cv_build_date],
+   [ac_cv_build_date=$(date +"%b %d %Y %H:%M %z")])
+ac_build_date="$ac_cv_build_date"
+AC_DEFINE_UNQUOTED(CONFIG_BUILD_DATE, ["$ac_build_date"], [Build date and time.])
+
 # Sanitize version string.
-ac_version=$(echo $PACKAGE_VERSION | sed -r 's/^([0-9|\.]+).*$/\1/')
+AC_CACHE_VAL([ac_cv_build_version],
+   [ac_cv_build_version=$(echo $PACKAGE_VERSION | sed -r 's/^([[0-9|\.]]+).*$/\1/')])
+ac_version="$ac_cv_build_version"
 AC_SUBST(ac_version)
 
 # Set default installation prefix.
@@ -130,8 +138,21 @@
 # Check for pkg-config.
 PKG_PROG_PKG_CONFIG
 
+# Check whether -std=c++11 support is necessary (4 < g++ version < 6).
+AC_CACHE_CHECK([for g++ major version], [ac_cv_gxx_version_major], [
+   ac_cv_gxx_version_major=$($CC -dumpversion)
+   if test -n "$ac_cv_gxx_version_major"; then
+      ac_cv_gxx_version_major=$(echo $ac_cv_gxx_version_major | cut -d'.' -f1);
+   fi
+   ac_gxx_version_major=$(($ac_cv_gxx_version_major + 0))
+])
+ac_gxx_version_major=$ac_cv_gxx_version_major
+if test $ac_gxx_version_major -gt 4 -a $ac_gxx_version_major -lt 6; then
+   CXXFLAGS="-std=c++11 $CXXFLAGS"
+fi
+
 # Check for proper flags.
-ac_arch=`uname -m`
+ac_arch=$(uname -m)
 
 # Check for install paths and alternatives...
 ac_libdirs="lib"
@@ -179,21 +200,29 @@
    AC_MSG_ERROR([qmake $ac_errmsg])
 fi
 
-# Check for proper Qt4/5 major version.
-ac_qt_version_major=`$ac_qmake -query QT_VERSION | cut -d. -f1`
+# Check for proper Qt major version.
+AC_CACHE_CHECK([for Qt major version], [ac_cv_qt_version_major], [
+   ac_cv_qt_version_major=$($ac_qmake -query QT_VERSION | cut -d'.' -f1)
+   ac_cv_qt_version_major=$(($ac_cv_qt_version_major + 0))
+])
+ac_qt_version_major=$ac_cv_qt_version_major
 if test "x$ac_qt4" = "xyes"; then
-   if test "x$ac_qt_version_major" != "x4"; then
+   if test $ac_qt_version_major -ne 4; then
       AC_MSG_ERROR([qmake-qt4 $ac_errmsg (qt4-devel)])
    fi
 else
-   if test "x$ac_qt_version_major" != "x5"; then
+   if test $ac_qt_version_major -ne 5; then
       AC_MSG_ERROR([qmake-qt5 $ac_errmsg (qt5-devel)])
    fi
 fi
 
-ac_qt_install_bins=`$ac_qmake -query QT_INSTALL_BINS`
-if test -d $ac_qt_install_bins; then
-   ac_path="$ac_qt_install_bins:$ac_path"
+# Check for proper Qt install path.
+AC_CACHE_CHECK([for Qt install path], [ac_cv_qt_install_path], [
+   ac_cv_qt_install_path=$($ac_qmake -query QT_INSTALL_BINS)
+])
+ac_qt_install_path=$ac_cv_qt_install_path
+if test -d $ac_qt_install_path; then
+   ac_path="$ac_qt_install_path:$ac_path"
 fi
 
 # Check it again, now with updated PATH, just in case...
@@ -205,20 +234,26 @@
 
 AC_SUBST(ac_qmake)
 
-ac_qt_install_headers=`$ac_qmake -query QT_INSTALL_HEADERS`
+AC_CACHE_CHECK([for Qt install headers], [ac_cv_qt_install_headers], [
+   ac_cv_qt_install_headers=$($ac_qmake -query QT_INSTALL_HEADERS)
+])
+ac_qt_install_headers=$ac_cv_qt_install_headers
 if test -d $ac_qt_install_headers; then
    CFLAGS="-I$ac_qt_install_headers $CFLAGS "
    CPPFLAGS="-I$ac_qt_install_headers $CPPFLAGS"
    ac_incpath="$ac_qt_install_headers $ac_incpath"
 fi
 
-ac_qt_install_libs=`$ac_qmake -query QT_INSTALL_LIBS`
+AC_CACHE_CHECK([for Qt install libraries], [ac_cv_qt_install_libs], [
+   ac_cv_qt_install_libs=$($ac_qmake -query QT_INSTALL_LIBS)
+])
+ac_qt_install_libs=$ac_cv_qt_install_libs
 if test -d $ac_qt_install_libs; then
    LIBS="-L$ac_qt_install_libs $LIBS"
    ac_libs="-L$ac_qt_install_libs $ac_libs"
 fi
 
-# Check for proper Qt4/5 version.
+# Finally, check for proper Qt4/5 version.
 if test "x$ac_qt4" = "xyes"; then
    AC_CACHE_CHECK([for Qt library version >= 4.4],
       ac_cv_qtversion, [
@@ -486,7 +521,7 @@
 # Output summary message
 
 echo
-echo "  $PACKAGE_NAME $PACKAGE_VERSION"
+echo "  $PACKAGE_NAME $PACKAGE_VERSION  ($ac_build_date)"
 echo
 echo "  Build target . . . . . . . . . . . . . . . . . . .: $ac_debug"
 echo