xxx component/qt: use qt4 by default + use pre-configure + fix section [qt-qmake] issue

component/qt/buildout.cfg

@@ -4,7 +4,7 @@ extends =
   ../mesa/buildout.cfg
 
 parts =
-  qt5-qmake
+  qt4-qmake
 
 [qt5-qmake]
 # building [qmake] will download the full qt source anyway ~200MB
@@ -43,17 +43,16 @@ location = ${buildout:parts-directory}/${:_buildout_section_name_}
 url = http://download.qt.io/official_releases/qt/4.8/4.8.7/qt-everywhere-opensource-src-4.8.7.tar.gz
 md5sum = d990ee66bf7ab0c785589776f35ba6ad
 # see https://github.com/NixOS/nixpkgs/blob/3e387c3e005c87566b5403d24c86f71f4945a79b/pkgs/development/libraries/qt-4.x/4.8/default.nix#L101
-configure-command =
+pre-configure =
+  set -e -x
   sed 's,/usr/X11R6/lib64,${libX11:location}/lib64 ${xproto:location}/lib64 ${libXext:location}/lib64,g' -i mkspecs/*/*.conf
   sed 's,/usr/X11R6/lib,${libX11:location}/lib ${xproto:location}/lib ${libXext:location}/lib,g' -i mkspecs/*/*.conf
   sed 's,/usr/X11R6/include,${libX11:location}/include ${xproto:location}/include ${libXext:location}/include,g' -i mkspecs/*/*.conf
-  ./configure --prefix=${:location} -v -no-separate-debug-info -release -no-fast -confirm-license -opensource
+configure-command = ./configure --prefix=${:location} -v -no-separate-debug-info -release -no-fast -confirm-license -opensource
 make-targets = qmake
 post-install =
   cp -rt ${:location} *
 
-[qt4-qmake]
-<= qt-qmake
 [qt4.8-qmake]
 <= qt4-qmake
 [qt4.8.7-qmake]