don't allow doxygen to run even if installed, something with the files
(at least as of 1.17.1) is causing it to eat huge amounts of memory

Index: lang/qt/Makefile.in
--- lang/qt/Makefile.in.orig
+++ lang/qt/Makefile.in
@@ -419,7 +419,7 @@ top_builddir = @top_builddir@
 top_srcdir = @top_srcdir@
 @RUN_GPG_TESTS_FALSE@tests = 
 @RUN_GPG_TESTS_TRUE@tests = tests
-SUBDIRS = src ${tests} doc
+SUBDIRS = src ${tests}
 EXTRA_DIST = README
 all: all-recursive