presence*: use xml2-config if available to detect libxml2 paths

modules_k/presence/Makefile

@@ -6,9 +6,20 @@ auto_gen=
 NAME=presence.so
 LIBS=
 
-DEFS+=-I/usr/include/libxml2 -I$(LOCALBASE)/include/libxml2 \
-      -I$(LOCALBASE)/include
-LIBS+=-L$(LOCALBASE)/lib -lxml2
+XML2CFG=$(shell which xml2-config)
+
+ifneq ($(XML2CFG),)
+
+	DEFS += $(shell $(XML2CFG) --cflags )
+	LIBS += $(shell $(XML2CFG) --libs)
+
+else
+
+	DEFS+=-I/usr/include/libxml2 -I$(LOCALBASE)/include/libxml2 \
+		-I$(LOCALBASE)/include
+	LIBS+=-L$(LOCALBASE)/lib -lxml2
+
+endif
 
 DEFS+=-DOPENSER_MOD_INTERFACE
 

modules_k/presence_dialoginfo/Makefile

@@ -4,9 +4,22 @@
 include ../../Makefile.defs
 auto_gen=
 NAME=presence_dialoginfo.so
-DEFS+=-I/usr/include/libxml2 -I$(LOCALBASE)/include/libxml2 \
-      -I$(LOCALBASE)/include
-LIBS+=-L$(LOCALBASE)/lib -lxml2
+LIBS=
+
+XML2CFG=$(shell which xml2-config)
+
+ifneq ($(XML2CFG),)
+
+	DEFS += $(shell $(XML2CFG) --cflags )
+	LIBS += $(shell $(XML2CFG) --libs)
+
+else
+
+	DEFS+=-I/usr/include/libxml2 -I$(LOCALBASE)/include/libxml2 \
+		-I$(LOCALBASE)/include
+	LIBS+=-L$(LOCALBASE)/lib -lxml2
+
+endif
 
 DEFS+=-DOPENSER_MOD_INTERFACE
 

modules_k/presence_xml/Makefile

@@ -6,9 +6,20 @@ auto_gen=
 NAME=presence_xml.so
 LIBS=
 
-DEFS+=-I/usr/include/libxml2 -I$(LOCALBASE)/include/libxml2 \
-      -I$(LOCALBASE)/include
-LIBS+=-L$(LOCALBASE)/lib -lxml2
+XML2CFG=$(shell which xml2-config)
+
+ifneq ($(XML2CFG),)
+
+	DEFS += $(shell $(XML2CFG) --cflags )
+	LIBS += $(shell $(XML2CFG) --libs)
+
+else
+
+	DEFS+=-I/usr/include/libxml2 -I$(LOCALBASE)/include/libxml2 \
+		-I$(LOCALBASE)/include
+	LIBS+=-L$(LOCALBASE)/lib -lxml2
+
+endif
 
 DEFS+=-DOPENSER_MOD_INTERFACE