Merge pull request #6779

b22692c build: Make use of ZMQ_CFLAGS (Cory Fields)

Author: laanwj

src/Makefile.am

@@ -214,7 +214,7 @@ libbitcoin_server_a_SOURCES = \
 if ENABLE_ZMQ
 LIBBITCOIN_ZMQ=libbitcoin_zmq.a
 
-libbitcoin_zmq_a_CPPFLAGS = $(BITCOIN_INCLUDES)
+libbitcoin_zmq_a_CPPFLAGS = $(BITCOIN_INCLUDES) $(ZMQ_CFLAGS)
 libbitcoin_zmq_a_SOURCES = \
   zmq/zmqabstractnotifier.cpp \
   zmq/zmqnotificationinterface.cpp \