Bring in Make.rule to build w/o proftp build tree installed.

--- proftpd-mod-prometheus.orig/Makefile.in
+++ proftpd-mod-prometheus/Makefile.in
@@ -2,12 +2,13 @@
 top_srcdir=../..
 srcdir=@srcdir@
 
-include $(top_srcdir)/Make.rules
+include debian/Make.rules
 
 .SUFFIXES: .la .lo
 
 SHARED_CFLAGS=-DPR_SHARED_MODULE
 SHARED_LDFLAGS=-avoid-version -export-dynamic -module
+SHARED_LDFLAGS += $(shell dpkg-buildflags --get LDFLAGS)
 VPATH=@srcdir@
 
 MODULE_LIBS=@MODULE_LIBS@
@@ -29,7 +30,7 @@
   lib/prometheus/text.lo
 
 # Necessary redefinitions
-INCLUDES=-I. -I./include -I../.. -I../../include @INCLUDES@
+INCLUDES=-I. -I./include -I../.. -I../../include -I/usr/include/proftpd @INCLUDES@
 CPPFLAGS= $(ADDL_CPPFLAGS) -DHAVE_CONFIG_H $(DEFAULT_PATHS) $(PLATFORM) $(INCLUDES)
 LDFLAGS=-L../../lib @LIBDIRS@
 
@@ -40,7 +41,7 @@
 	$(LIBTOOL) --mode=compile --tag=CC $(CC) $(CPPFLAGS) $(CFLAGS) $(SHARED_CFLAGS) -c $< -o $@
 
 shared: $(SHARED_MODULE_OBJS)
-	$(LIBTOOL) --mode=link --tag=CC $(CC) -o $(MODULE_NAME).la $(SHARED_MODULE_OBJS) -rpath $(LIBEXECDIR) $(LDFLAGS) $(SHARED_LDFLAGS) $(SHARED_MODULE_LIBS) `cat $(MODULE_NAME).c | grep '$$Libraries:' | sed -e 's/^.*\$$Libraries: \(.*\)\\$$/\1/'`
+	$(LIBTOOL) --mode=link --tag=CC $(CC) -o $(MODULE_NAME).la $(SHARED_MODULE_OBJS) -rpath $(LIBEXECDIR) $(SHARED_LDFLAGS) $(MODULE_LIBS) `cat $(MODULE_NAME).c | grep '$$Libraries:' | sed -e 's/^.*\$$Libraries: \(.*\)\\$$/\1/'`
 
 static: $(MODULE_OBJS)
 	test -z "$(MODULE_LIBS)" || echo "$(MODULE_LIBS)" >> $(MODULE_LIBS_FILE)
