diff --git a/Makefile b/Makefile
index 19130fd..050eff9 100755
--- a/Makefile
+++ b/Makefile
@@ -7,7 +7,7 @@ LIBI2PD_PATH = $(I2PD_PATH)/libi2pd
 LIBI2PD_CLIENT_PATH = $(I2PD_PATH)/libi2pd_client
 
 CXX ?= g++
-CXXFLAGS = -Wall -std=c++17
+CXXFLAGS = -Wall -std=c++17 -O2
 INCFLAGS = -I$(LIBI2PD_PATH) -I$(LIBI2PD_CLIENT_PATH)
 DEFINES = -DOPENSSL_SUPPRESS_DEPRECATED
 
diff --git a/dependencies.sh b/dependencies.sh
index d44f3dd..aaddcaf 100755
--- a/dependencies.sh
+++ b/dependencies.sh
@@ -8,61 +8,64 @@ dependNix="libboost-chrono-dev \
     libboost-thread-dev \
     libssl-dev \
     zlib1g-dev"
-
 dependWin="mingw-w64-x86_64-boost \
     mingw-w64-x86_64-openssl \
     mingw-w64-x86_64-zlib"
 
-kernel=`uname -a`
-function isLsbReleaseExists() {
-  if which lsb_release > /dev/null; # do whereis can be too?
-  then
-	  return 0
-  else
-	  return 1
-  fi
+kernel=$(uname -a)
+
+function anotherDistr() {
+    echo "Just install libboost and libopenssl dev packages on your pc"
+    return 0
 }
 
-function anotherDistr(){
- 	echo "Just install libboost and libopenssl dev packages on your pc";
-	return 0
+function installDnf() {
+    sudo dnf install boost-devel g++
 }
 
-function installDeb(){
-	 sudo apt-get install $dependNix;
-	 return 0
+function installDeb() {
+    sudo apt-get install $dependNix
+    return 0
 }
-function installOnGentoo(){
-		sudo emerge --deep --newuse dev-libs/boost dev-libs/openssl;
-		return 0
+
+function installOnGentoo() {
+    sudo emerge --deep --newuse dev-libs/boost dev-libs/openssl
+    return 0
 }
+
 function installOnWin() {
-		pacman -S $depenWin;
-		return 0
+    pacman -S $dependWin
+    return 0
 }
 
 function doInstallDepencies() {
-case "$1" in
-	*Ubuntu*|*Debian*)
-		installDeb
-		;;
-        *gentoo*)
-		installOnGentoo
-		;;
-	*MINGW64*)
-		installOnWin
-		;;
-	*)
-		anotherDistr
-		;;
-esac
+    case "$1" in
+    *Ubuntu* | *Debian*)
+        installDeb
+        ;;
+    *gentoo*)
+        installOnGentoo
+        ;;
+    *MINGW64*)
+        installOnWin
+        ;;
+    *dnf*)
+        installDnf
+        ;;
+    *)
+        anotherDistr
+        ;;
+    esac
 }
 
-if isLsbReleaseExists ;
-then
- distr=`lsb_release -i`
- doInstallDepencies "$distr"
-else #
- doInstallDepencies "$kernel"
+isLsbReleaseExists=$(which lsb_release > /dev/null 2>&1; echo $?)
+if [ $isLsbReleaseExists -eq 0 ]; then
+    distr=$(lsb_release -i)
+    doInstallDepencies "$distr"
+elif test -e /etc/fedora-release || which dnf > /dev/null; then
+    printf "Like you use fedora/redhat distr\n"
+    doInstallDepencies "dnf"
+else
+    doInstallDepencies "$kernel"
 fi
 
diff --git a/vain.cpp b/vain.cpp
index 4d2993b..148d33f 100755
--- a/vain.cpp
+++ b/vain.cpp
@@ -404,10 +404,7 @@ int main (int argc, char * argv[])
      			{
      	 			//keys = i2p::data::PrivateKeys::CreateRandomKeys (options.signature);
      				//RAND_bytes( KeyBuf+MutateByte , 90 ); // FoundNonce is
-
-				for (unsigned i = options.threads-1;i--;)
-     		 			delete [] KeyBufs[i];
-				delete [] KeyBufs;
+                                DELKEYBUFS(options.threads);
      				std::cout << "(Generate a new keypair) Attempts #" << ++attempts << std::endl;
 				return 1;
      			}
@@ -445,9 +442,7 @@ int main (int argc, char * argv[])
      	if (f)
      	{
      		f.write ((char *)KeyBuf, keys_len);
-		for (unsigned i = options.threads-1;i--;)
-     		 delete [] KeyBufs[i];
-		delete [] KeyBufs;
+		DELKEYBUFS(options.threads);
      	}
      	else
      		std::cout << "Can't create file " << options.outputpath << std::endl;
diff --git a/vanity.hpp b/vanity.hpp
index bc9b8f9..6ba379e 100755
--- a/vanity.hpp
+++ b/vanity.hpp
@@ -84,3 +84,8 @@ const uint8_t lastBlock[64] =
 		0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 		0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0C, 0x38  // 3128 bits (391 bytes)	
 	};
+
+#define DELKEYBUFS(S) {\
+for (unsigned i = S-1;i--;) \
+ delete [] KeyBufs[i];\
+delete [] KeyBufs;}