xhttp_pi: fix cross-compilation

modules/xhttp_pi/Makefile

@@ -9,9 +9,18 @@ NAME=xhttp_pi.so
 DEFS +=
 LIBS +=
 
-DEFS+=-I/usr/include/libxml2 -I$(LOCALBASE)/include/libxml2 \
-      -I$(LOCALBASE)/include
-LIBS+=-L$(LOCALBASE)/lib -lxml2
+ifeq ($(CROSS_COMPILE),)
+XML2CFG=$(shell which xml2-config)
+endif
+
+ifneq ($(XML2CFG),)
+	DEFS += $(shell $(XML2CFG) --cflags )
+	LIBS += $(shell $(XML2CFG) --libs)
+else
+	DEFS += -I$(LOCALBASE)/include/libxml2 \
+		-I$(LOCALBASE)/include
+	LIBS += -L$(LOCALBASE)/lib -lxml2
+endif
 
 DEFS+=-DKAMAILIO_MOD_INTERFACE