Add dependency on qofbook.h for swig generated file.

Otherwise the old generated file complains about a missing declaration
from r21832.

git-svn-id: svn+ssh://svn.gnucash.org/repo/gnucash/trunk@21840 57a11ea4-9604-0410-9ed3-97b8803252fd

src/engine/Makefile.am

@@ -189,7 +189,14 @@ endif
 noinst_DATA = .scm-links
 
 if BUILDING_FROM_SVN
+
+# The generated file depends on various libqof headers. Out of
+# laziness I only include one here - more might be needed
+# subsequently.
+QOFHEADERS = $(top_srcdir)/src/libqof/qof/qofbook.h
+
 swig-engine.c: engine.i $(top_srcdir)/src/base-typemaps.i \
+               $(QOFHEADERS) \
                $(gncinclude_HEADERS) $(noinst_HEADERS)
 	$(SWIG) -guile $(SWIG_ARGS) -Linkage module \
 	-I${top_srcdir}/src/libqof/qof -I${top_srcdir}/src -o $@ $<