[doc] fix header file paths for out-of-source builds

diff --git a/doc/doxygen/Doxyfile.in b/doc/doxygen/Doxyfile.in
index c065cb813e15b0b84bfb5c9d0e0e4aab217a8e06..e984531caa021b2813992bd69d1f43635c3e1547 100644 (file)
--- a/doc/doxygen/Doxyfile.in
+++ b/doc/doxygen/Doxyfile.in
@@ -678,8 +678,8 @@ WARN_LOGFILE           =
 # with spaces.
 
 INPUT                  = . \
-                         ../../RtAudio.h \
-                         ../../RtError.h
+                         @top_srcdir@/RtAudio.h \
+                         @top_srcdir@/rtaudio_c.h
 
 # This tag can be used to specify the character encoding of the source files 
 # that doxygen parses. Internally doxygen uses the UTF-8 encoding, which is