+printf "Checking for -lpcap... "
+printf "#include <pcap.h>\nint main() { return 0; }\n" > build_check.c
+$CXX $CXXFLAGS $LDFLAGS build_check.c -lpcap -o fake > /dev/null 2> /dev/null
+if [ $? != 0 ]
+then
+    CHECK_PCAP=no
+    printf "no\n"
+else
+    CHECK_PCAP=yes
+    printf "yes\n"
+fi
+rm -f fake
+
+printf "Checking for -lnfnetlink... "
+printf "#include <linux/netfilter.h>\nint main() { return 0; }\n" > build_check.c
+$CXX $CXXFLAGS $LDFLAGS build_check.c -lnfnetlink -o fake > /dev/null 2> /dev/null
+if [ $? != 0 ]
+then
+    CHECK_NFNETLINK=no
+    printf "no\n"
+else
+    CHECK_NFNETLINK=yes
+    printf "yes\n"
+fi
+rm -f fake
+
+printf "Checking for -lnetfilter_queue... "
+printf "#include <libnetfilter_queue/libnetfilter_queue.h>\nint main() { return 0; }\n" > build_check.c
+$CXX $CXXFLAGS $LDFLAGS build_check.c -lnetfilter_queue -o fake > /dev/null 2> /dev/null
+if [ $? != 0 ]
+then
+    CHECK_NFQ=no
+    printf "no\n"
+else
+    CHECK_NFQ=yes
+    printf "yes\n"
+fi
+rm -f fake
+