install_bin: display help text if no bins found

docs/changes.txt

@@ -521,3 +521,5 @@ nfqws: use wireless ext in case nl80211 does not return SSID
 v71.2
 
 nfqws: apply udp desync to replayed packets with non-zero reasm offset (except fake)
+blockcheck: display curl version and kernel version
+install_bin: stop if no binaries found. display help text.

install_bin.sh

@@ -127,8 +127,42 @@ ccp()
 	#cp -f "../$BINS/$1" "$ZAPRET_BASE/$2" && echo copying : "../$BINS/$1" =\> "$ZAPRET_BASE/$2"
 }
 
+
 UNAME=$(uname)
 
+if [ ! -d "$BINDIR" ] || ! dir_is_not_empty "$BINDIR" ]; then
+	echo "no binaries found"
+	case $UNAME in
+		Linux)
+			echo "you need to download release from github or build binaries from source"
+			echo "building from source requires debian/ubuntu packages : make gcc zlib1g-dev libcap-dev libnetfilter-queue-dev libmnl-dev libsystemd-dev"
+			echo "on distributions with other package manager find dev package analogs"
+			echo "to compile on systems with systemd : make systemd"
+			echo "to compile on other systems : make"
+			;;
+		Darwin)
+			echo "you need to download release from github or build binaries from source"
+			echo "to compile : make mac"
+			;;
+		FreeBSD)
+			echo "you need to download release from github or build binaries from source"
+			echo "to compile : make"
+			;;
+		OpenBSD)
+			echo "to compile : make bsd"
+			;;
+		CYGWIN*)
+			echo "you need to download release from github or build binaries from source"
+			echo "to compile : read docs"
+			echo "to make things easier use zapret-win-bundle"
+			;;
+		*)
+			echo "to compile : make"
+			;;
+	esac
+	exit 1
+fi
+
 unset PKTWS
 case $UNAME in
 	Linux)