Added warning for SIP and library search path issue

install

@@ -31,6 +31,19 @@ do_install()
 {
   set -e
 
+  # Check for SIP if on El Capitan
+  if [[ `sw_vers -productVersion` == *"10.11"* ]]
+  then
+    if `csrutil status | grep -q enabled`
+    then
+      echo "You have System Integrity Protection enabled."
+      echo
+      echo "This prevents DYLD_LIBRARY_PATH from being exported to subshells"
+      echo "Please add: export DYLD_LIBRARY_PATH=$DYLD_LIBRARY_PATH:/opt/ros/$ROS_DISTRO/lib"
+      echo "To the start of /opt/ros/$ROS_DISTRO/bin/rosrun to fix this issue."
+    fi
+  fi
+
   # Homebrew
   if ! hash brew 2>/dev/null; then
     ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"