Portability: work through top_builddir. builddir can be undefined

diff --git a/src/Makefile.am b/src/Makefile.am
index 72cfa8012dfee61e46bbcfdf626c8fb7c9c9a698..b370cbcb21deaced3ad0553a7f0306b9ff36fa1b 100644 (file)
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -874,7 +874,7 @@ cache_cf.o: cf_parser.cci
 
 # cf_gen builds the configuration files.
 cf_gen$(EXEEXT): $(cf_gen_SOURCES) $(cf_gen_DEPENDENCIES)
-       $(HOSTCXX) -o $@ $(srcdir)/cf_gen.cc -I$(top_builddir)/include/ -I$(srcdir) -I$(builddir)
+       $(HOSTCXX) -o $@ $(srcdir)/cf_gen.cc -I$(srcdir) -I$(top_builddir)/include/ -I$(top_builddir)/src
 
 # squid.conf.default is built by cf_gen when making cf_parser.cci
 squid.conf.default squid.conf.documented: cf_parser.cci