diff -up qwt-6.1.1/textengines/mathml/mathml.pro.pkgconfig qwt-6.1.1/textengines/mathml/mathml.pro

--- qwt-6.1.1/textengines/mathml/mathml.pro.pkgconfig	2014-09-18 09:59:46.613028743 -0500

+++ qwt-6.1.1/textengines/mathml/mathml.pro	2014-09-20 14:15:54.962624868 -0500

@@ -60,6 +60,8 @@ contains(QWT_CONFIG, QwtPkgConfig) {

     QMAKE_PKGCONFIG_LIBDIR = $${QWT_INSTALL_LIBS}

     QMAKE_PKGCONFIG_INCDIR = $${QWT_INSTALL_HEADERS}

+    

+    QMAKE_PKGCONFIG_DESTDIR = pkgconfig

     # QMAKE_PKGCONFIG_DESTDIR is buggy, in combination

     # with including pri files: better don't use it