diff --git a/configure.in b/configure.in
index dc56eba..5e0e660 100644
--- a/configure.in
+++ b/configure.in
@@ -42,7 +42,7 @@ AC_SUBST(LEAST)
 AC_MSG_CHECKING(QT4 directory)
 QTDIR="no"
 AC_ARG_WITH([qt-dir],
-             AC_HELP_STRING([--with-qt-dir=/path/to/Qt4],
+             AC_HELP_STRING([--with-qt-dir=/path/to/Qt4/include],
                             [to specify the path to the Qt4 directory.]),
              [QTPATHS="$withval"],
              [QTPATHS="/usr/include/qt4 /usr/local/include/qt4 /opt/include/qt4 /opt/local/include/qt4 /opt/local/libexec/qt4-mac/include /usr/include /usr/local/include /opt/include /opt/local/include"])
@@ -62,29 +62,30 @@ if test -z "$QTLIBDIR"; then
    AC_MSG_WARN(Could not locate QT 4.1)
   case $host in
     *darwin*)
-        CPPFLAGS+=" -DQ_OS_MAC"
+      LDFLAGS+=" -lproxy"
       ;;
     *mingw*|*win*)
       LDFLAGS+=" -lwinhttp"
-        CPPFLAGS+=" -DQ_OS_WIN32"
       ;;
     *)
       LDFLAGS+=" -lproxy"
-        CPPFLAGS+=" -DQ_OS_LINUX"
       ;;
   esac
 else
   # by now, Linux/Unix always uses libproxy
   case $host in
     *darwin*)
+      CPPFLAGS+=" -DQ_OS_MAC"
       LDFLAGS+=" -L$QTLIBDIR -lQtCore -lQtNetwork -lQtGui"
       ;;
     *mingw*|*win*)
       LDFLAGS+=" -L$QTLIBDIR -lQtCore4 -lQtNetwork4 -lQtGui4"
+      CPPFLAGS+=" -DQ_OS_WIN32"
       ;;
     *)
       LDFLAGS+=" -L$QTLIBDIR -lQtCore -lQtNetwork -lQtGui"
       LDFLAGS+=" -lproxy"
+      CPPFLAGS+=" -DQ_OS_LINUX"
       ;;
   esac
   CPPFLAGS+=" -DUNICODE -DQT_NO_DEBUG"