fixed missing dependencies in makefile (llm-d#330)

* fixed missing dependencies in makefile

Signed-off-by: Nir Rozenbaum <nirro@il.ibm.com>

* fixed comment in Makefile

Signed-off-by: Nir Rozenbaum <nirro@il.ibm.com>

---------

Signed-off-by: Nir Rozenbaum <nirro@il.ibm.com>

Author: nirrozenbaum

Makefile

@@ -397,11 +397,11 @@ install-dependencies: ## Install development dependencies based on OS/ARCH
 	  fi; \
 	elif [ "$(TARGETOS)" = "darwin" ]; then \
 	  if [ -x "$$(command -v brew)" ]; then \
-	    if ! brew list zeromq >/dev/null 2>&1; then \
+	    if ! brew list zeromq pkg-config >/dev/null 2>&1; then \
 	      echo "Installing dependencies with brew..."; \
-	      brew install zeromq; \
+	      brew install zeromq pkg-config; \
 	    else \
-	      echo "✅ ZeroMQ is already installed."; \
+	      echo "✅ ZeroMQ and pkgconf are already installed."; \
 	    fi; \
 	  else \
 	    echo "Homebrew is not installed and is required to install zeromq. Install it from https://brew.sh/"; \