--- qsampler/trunk/configure.ac	2013/11/01 17:44:30	2480
+++ qsampler/trunk/configure.ac	2013/11/07 18:22:48	2481
@@ -1,5 +1,5 @@
 # Process this file with autoconf to produce a configure script.
-AC_INIT(Qsampler, 0.2.2.41, rncbc@rncbc.org, qsampler)
+AC_INIT(Qsampler, 0.2.2.42, rncbc@rncbc.org, qsampler)
 
 AC_CONFIG_SRCDIR(src/qsampler.cpp)
 AC_CONFIG_HEADERS(src/config.h)
@@ -29,6 +29,25 @@
 fi
 AC_SUBST(ac_debug)
 
+
+# Enable Qt4/5 availability.
+AC_ARG_ENABLE(qt4,
+  AC_HELP_STRING([--enable-qt4], [enable Qt4 build (default=yes)]),
+  [ac_qt4="$enableval"],
+  [ac_qt4="yes"])
+
+AC_ARG_ENABLE(qt5,
+  AC_HELP_STRING([--enable-qt5], [enable Qt5 build (default=no)]),
+  [ac_qt5="$enableval"],
+  [ac_qt5="no"])
+
+if test "x$ac_qt4" = "xno"; then
+   ac_qt5="yes"
+fi
+if test "x$ac_qt5" = "xyes"; then
+   ac_qt4="no"
+fi
+
 # Enable libgig availability.
 AC_ARG_ENABLE(libgig,
   AC_HELP_STRING([--enable-libgig], [enable libgig interface (default=yes)]),
@@ -45,9 +64,18 @@
 # Standard installation base dirs.
 ac_with_paths="/usr /usr/local"
 
+ac_qtdirs="qt"
+
+if test "x$ac_qt4" = "xyes"; then
+   ac_qtdirs="qt4 $ac_qtdirs"
+fi
+if test "x$ac_qt5" = "xyes"; then
+   ac_qtdirs="qt5 $ac_qtdirs"
+fi
+
 # Some a-la-debian alternatives...
 for X in /usr/lib /usr/lib64 /usr/share; do
-  for Y in qt qt4 qt5; do
+  for Y in $ac_qtdirs; do
     if test -d $X/$Y/bin; then
       ac_with_paths="$ac_with_paths $X/$Y"
     fi
@@ -91,7 +119,7 @@
 #   ac_path="$X:$ac_path"
 # fi
   if test -d $X/include; then
-    for Y in qt qt4 qt5; do
+    for Y in $ac_qtdirs; do
       if test -d $X/include/$Y; then
         CFLAGS="-I$X/include/$Y $CFLAGS"
         CPPFLAGS="-I$X/include/$Y $CPPFLAGS"
@@ -114,7 +142,7 @@
 
 # Check for proper flags.
 ac_arch=`uname -m`
-if test "$ac_arch" == "x86_64"; then
+if test "x$ac_arch" = "xx86_64"; then
    CFLAGS="-fPIC $CFLAGS"
    CPPFLAGS="-fPIC $CPPFLAGS"
 fi