Index: squid-3.1.4/configure.in
===================================================================
--- squid-3.1.4.orig/configure.in	2010-05-30 17:21:49.000000000 +0400
+++ squid-3.1.4/configure.in	2010-07-06 15:41:52.000000000 +0400
@@ -2116,6 +2116,10 @@
 	;;
 esac
 
+dnl Define BUILD_CXX
+BUILD_CXX="$BUILD_CXX"
+AC_SUBST(BUILD_CXX)
+
 dnl Check for programs
 AC_PROG_CPP
 AC_PROG_INSTALL
Index: squid-3.1.4/src/Makefile.am
===================================================================
--- squid-3.1.4.orig/src/Makefile.am	2010-05-30 17:21:11.000000000 +0400
+++ squid-3.1.4/src/Makefile.am	2010-07-06 15:42:29.000000000 +0400
@@ -751,6 +751,13 @@
 squid.conf.default squid.conf.documented: cf_parser.cci
 	true
 
+BUILD_CXX ?= @BUILD_CXX@
+
+cf_gen$(EXEEXT): $(cf_gen_SOURCES) $(cf_gen_DEPENDENCIES)
+	$(BUILD_CXX) -o $@ $(srcdir)/cf_gen.cc \
+		$(top_srcdir)/lib/util.c $(top_srcdir)/compat/assert.cc \
+		-DNDEBUG -DBUILD_HOST_TOOL ${INCLUDES}
+
 cf_parser.cci: cf.data cf_gen$(EXEEXT)
 	./cf_gen cf.data $(srcdir)/cf.data.depend