added Gentoo support

other systems can be added just as easily

scripts/deps.sh

@@ -1 +1,15 @@
-sudo apt-get install -y cmake libgtkmm-3.0-dev libglibmm-2.4-dev libtorrent-rasterbar-dev libboost-all-dev libssl-dev
+#!/bin/bash
+SATISFIED=0
+if [ -f "/etc/debian_version" ]; then
+  sudo apt-get install -y cmake libgtkmm-3.0-dev libglibmm-2.4-dev libtorrent-rasterbar-dev libboost-all-dev libssl-dev
+  SATISFIED=1
+fi
+
+if [ -f "/etc/gentoo-release" ]; then
+  emerge -vq dev-util/cmake dev-cpp/gtkmm dev-cpp/glibmm net-libs/rb_libtorrent dev-libs/boost dev-libs/openssl
+  SATISFIED=1
+fi
+
+if [ "$SATISFIED" -ne "1" ]; then
+  echo "Your system isn't supported yet."
+fi