build: Fix out of tree gtk-doc generation

Various headers are build in builddirs (clutter-marshal.h, mkenums
headers and cogl-define.h) so we need to add the corresponding include
paths for gtk-doc to build its scanner.

diff --git a/doc/reference/clutter/Makefile.am b/doc/reference/clutter/Makefile.am
index f0486c2..949bace 100644 (file)
--- a/doc/reference/clutter/Makefile.am
+++ b/doc/reference/clutter/Makefile.am
@@ -146,7 +146,7 @@ expand_content_files= \
 # e.g. INCLUDES=-I$(top_srcdir) -I$(top_builddir) $(GTK_DEBUG_FLAGS)
 # e.g. GTKDOC_LIBS=$(top_builddir)/gtk/$(gtktargetlib)
 
-INCLUDES=-I$(top_srcdir) -I$(top_srcdir)/clutter -I$(top_srcdir)/clutter/cogl $(CLUTTER_CFLAGS)
+INCLUDES=-I$(top_srcdir) -I$(top_srcdir)/clutter -I$(top_srcdir)/clutter/cogl -I$(top_builddir) -I$(top_builddir)/clutter -I$(top_builddir)/clutter/cogl $(CLUTTER_CFLAGS)
 GTKDOC_LIBS=$(top_builddir)/clutter/libclutter-@CLUTTER_WINSYS@-@CLUTTER_API_VERSION@.la $(CLUTTER_LIBS)
 
 # This includes the standard gtk-doc make rules, copied by gtkdocize.