Make ZMQ optional in build.

configure.ac

@@ -75,10 +75,10 @@ JANSSON_LIBS="jansson-2.10/src/.libs/libjansson.a"
 
 AC_SUBST(JANSSON_LIBS)
 
-AC_SEARCH_LIBS(clock_nanosleep, rt, , "Error: Required library rt not found." && exit 1)
+AC_SEARCH_LIBS(clock_nanosleep, rt, , echo "Error: Required library rt not found." && exit 1)
 AC_SEARCH_LIBS(exp, m, , echo "Error: Required library math not found." && exit 1)
-AC_SEARCH_LIBS(pthread_mutex_trylock, pthread, , "Error: Required library pthreads not found." && exit 1)
-AC_SEARCH_LIBS(zmq_socket, zmq, , "Error: Required library zmq not found." && exit 1)
+AC_SEARCH_LIBS(pthread_mutex_trylock, pthread, , echo "Error: Required library pthreads not found." && exit 1)
+AC_SEARCH_LIBS(zmq_socket, zmq, ZMQ=yes, ZMQ=no)
 
 AC_OUTPUT([Makefile] [src/Makefile])
 
@@ -87,6 +87,7 @@ LDFLAGS="${LDFLAGS} -Wl,--as-needed"
 echo
 echo "Compilation............: make (or gmake)"
 echo "  YASM (Intel ASM).....: $YASM"
+echo "  ZMQ..................: $ZMQ"
 echo "  CPPFLAGS.............: $CPPFLAGS"
 echo "  CFLAGS...............: $CFLAGS"
 echo "  LDFLAGS..............: $LDFLAGS"

src/stratifier.c

@@ -19,7 +19,10 @@
 #include <math.h>
 #include <string.h>
 #include <unistd.h>
+
+#ifdef HAVE_ZMQ_H
 #include <zmq.h>
+#endif
 
 #include "ckpool.h"
 #include "libckpool.h"
@@ -8648,6 +8651,7 @@ static void read_poolstats(ckpool_t *ckp, int *tvsec_diff)
 
 static void *zmqnotify(void *arg)
 {
+#ifdef HAVE_ZMQ_H
 	ckpool_t *ckp = arg;
 	sdata_t *sdata = ckp->sdata;
 	void *context, *notify;
@@ -8709,6 +8713,8 @@ static void *zmqnotify(void *arg)
 
 	zmq_close(notify);
 	zmq_ctx_destroy (context);
+#endif
+	pthread_detach(pthread_self());
 
 	return NULL;
 }