diff -up jack2-1.9.12/doxyfile.in.outdir jack2-1.9.12/doxyfile.in
--- jack2-1.9.12/doxyfile.in.outdir	2017-12-26 17:41:13.121923158 +0100
+++ jack2-1.9.12/doxyfile.in	2017-12-26 17:41:29.048755116 +0100
@@ -38,7 +38,7 @@ PROJECT_NUMBER         = @VERSION@
 # If a relative path is entered, it will be relative to the location
 # where doxygen was started. If left blank the current directory will be used.
 
-OUTPUT_DIRECTORY       = 
+OUTPUT_DIRECTORY       = default/
 
 # If the CREATE_SUBDIRS tag is set to YES, then doxygen will create
 # 4096 sub-directories (in 2 levels) under the output directory of each output