Better AC macro

Author: scemama

.github/workflows/test-build.yml

@@ -16,7 +16,7 @@ jobs:
     - uses: actions/checkout@v2
 
     - name: Install zeromq
-      run: sudo apt-get install libzmq5
+      run: sudo apt-get install libzmq3-dev
 
     - name: Build
       run: |

build-config/m4/ax_zmq.m4

@@ -60,8 +60,13 @@ AC_DEFUN([AX_ZMQ], [
 #endif
             ],[
                 AC_MSG_RESULT(yes)
-                HAVE_ZMQ=1
-                ZMQ_LIBS="-lzmq"
+                AC_CHECK_LIB([zmq],[zmq_send],[
+                    HAVE_ZMQ=1
+                    ZMQ_LIBS="-lzmq"
+                  ],[
+                    AC_MSG_ERROR([libzmq.so not in LIBRARY_PATH])
+                  ])
+                         
                 AC_SUBST(ZMQ_LDFLAGS)
                 AC_SUBST(ZMQ_CPPFLAGS)
                 AC_SUBST(ZMQ_LIBS)