https://bugs.gentoo.org/949580
Lift document disablement from sed on configure to
patch on configure.ac, disable example building,
as they are thrown away afterwards anyway.
--- a/configure.ac
+++ b/configure.ac
@@ -49,7 +49,7 @@
 PKG_PROG_PKG_CONFIG
 
 # Check for doxygen
-AC_CHECK_PROG(HAVE_DOXYGEN, doxygen, true, false)
+AC_CHECK_PROG(HAVE_DOXYGEN, doxygen-dummy, true, false)
 AM_CONDITIONAL(HAVE_DOXYGEN,$HAVE_DOXYGEN)
 if test $HAVE_DOXYGEN = "false"; then
              AC_MSG_WARN([*** doxygen not found, docs will not be built])
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -1,3 +1,3 @@
 ## Process this file with automake to produce Makefile.in
 
-SUBDIRS = libfishsound examples tests
+SUBDIRS = libfishsound tests