diff -uNr sshping-0.1.4/Makefile sshping-0.1.4.mod/Makefile
--- sshping-0.1.4/Makefile	2018-03-19 23:48:55.000000000 +0200
+++ sshping-0.1.4.mod/Makefile	2021-08-07 01:15:24.209724177 +0300
@@ -4,8 +4,8 @@
 
 sshping: bin/sshping
 
-bin/sshping: src/sshping.cxx /usr/include/libssh/libssh.h
-	g++ -Wall -I ext/ -o bin/sshping src/sshping.cxx -lssh
+bin/sshping: src/sshping.cxx
+	$(CXX) $(CXXFLAGS) $(CPPFLAGS) $(LDFLAGS) -Wall -I ext/ -o bin/sshping src/sshping.cxx -lssh
 
 /usr/include/libssh/libssh.h:
 	echo '*** Please install libssh-dev, libssh-devel, or similar package'