apidoc: Fix rebuild in out-of-tree builds

diff --git a/Makefile.am b/Makefile.am
index 99356b0..898b262 100644 (file)
--- a/Makefile.am
+++ b/Makefile.am
@@ -39,7 +39,7 @@ Doxyfile :    Doxyfile.in
 
 apidoc :       Doxyfile
                @test -d apidoc || doxygen
-               @! find Doxyfile src/ \( -name '*.h' -o -name '*.md' \) -newer apidoc | \
+               @! find Doxyfile $(top_srcdir)/src/ \( -name '*.h' -o -name '*.md' \) -newer apidoc | \
                        grep -q '' || doxygen && touch apidoc
 
 cov-reset-common: