Add external dependency for libzmq & zmq.h.

rockspecs/lua-zmq-1.0-1.rockspec

@@ -12,11 +12,19 @@ description = {
 dependencies = {
 	"lua >= 5.1",
 }
+external_dependencies = {
+	ZEROMQ = {
+		header = "zmq.h",
+		library = "zmq",
+	}
+}
 build = {
 	type = "builtin",
 	modules = {
 		zmq = {
 			sources = {"src/pre_generated-zmq.nobj.c"},
+			incdirs = "$(ZEROMQ_INCDIR)",
+			libdirs = "$(ZEROMQ_LIBDIR)",
 			libraries = {"zmq"},
 		},
 	},

rockspecs/lua-zmq-scm-1.rockspec

@@ -11,11 +11,19 @@ description = {
 dependencies = {
 	"lua >= 5.1",
 }
+external_dependencies = {
+	ZEROMQ = {
+		header = "zmq.h",
+		library = "zmq",
+	}
+}
 build = {
 	type = "builtin",
 	modules = {
 		zmq = {
 			sources = {"src/pre_generated-zmq.nobj.c"},
+			incdirs = "$(ZEROMQ_INCDIR)",
+			libdirs = "$(ZEROMQ_LIBDIR)",
 			libraries = {"zmq"},
 		},
 	},