cv_dnn: build failure due to "No rule to make target '[..]/PROTOBUF_PROTOC_EXECUTABLE-NOTFOUND'"

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Base path: /home/kbrown/util_ws
Source space: /home/kbrown/util_ws/src
Build space: /home/kbrown/util_ws/build
Devel space: /home/kbrown/util_ws/devel
Install space: /home/kbrown/util_ws/install
####
#### Running command: "make cmake_check_build_system" in "/home/kbrown/util_ws/build"
####
####
#### Running command: "make -j2 -l2" in "/home/kbrown/util_ws/build"
####
make[2]: *** No rule to make target '/home/kbrown/util_ws/src/cv_dnn/PROTOBUF_PROTOC_EXECUTABLE-NOTFOUND', needed by 'cv_dnn/caffe.pb.cc'.  Stop.
CMakeFiles/Makefile2:437: recipe for target 'cv_dnn/CMakeFiles/cv_dnn.dir/all' failed
make[1]: *** [cv_dnn/CMakeFiles/cv_dnn.dir/all] Error 2
Makefile:138: recipe for target 'all' failed
make: *** [all] Error 2
Invoking "make -j2 -l2" failed

this is the CMakeList file for the package im trying to install:

cmake_minimum_required(VERSION 2.8.3)
project(cv_dnn)

## Add support for C++11, supported in ROS Kinetic and newer
# add_definitions(-std=c++11)

## Find catkin macros and libraries
## if COMPONENTS list like find_package(catkin REQUIRED COMPONENTS xyz)
## is used, also find other catkin packages
find_package(
  catkin REQUIRED COMPONENTS
  cv_bridge
  roscpp
)

## System dependencies are found with CMake's conventions
find_package(
  OpenCV REQUIRED COMPONENTS 
  core
  imgproc
  )
find_package(
  Protobuf REQUIRED
)


## Uncomment this if the package has a setup.py. This macro ensures
## modules and global scripts declared therein get installed
## See http://ros.org/doc/api/catkin/html/user_guide/setup_dot_py.html
# catkin_python_setup()

################################################
## Declare ROS messages, services and actions ##
################################################

## To declare and build messages, services or actions from within this
## package, follow these steps:
## * Let MSG_DEP_SET be the set of packages whose message types you use in
##   your messages/services/actions (e.g. std_msgs, actionlib_msgs, ...).
## * In the file package.xml:
##   * add a build_depend tag for "message_generation"
##   * add a build_depend and a run_depend tag for each package in MSG_DEP_SET
##   * If MSG_DEP_SET isn't empty the following dependency has been pulled in
##     but can be declared for certainty nonetheless:
##     * add a run_depend tag for "message_runtime"
## * In this file (CMakeLists.txt):
##   * add "message_generation" and every package in MSG_DEP_SET to
##     find_package(catkin REQUIRED COMPONENTS ...)
##   * add "message_runtime" and every package in MSG_DEP_SET to
##     catkin_package(CATKIN_DEPENDS ...)
##   * uncomment the add_*_files sections below as needed
##     and list every .msg/.srv/.action file to be processed
##   * uncomment the generate_messages entry below
##   * add every package in MSG_DEP_SET to generate_messages(DEPENDENCIES ...)

## Generate messages in the 'msg' folder
# add_message_files(
#   FILES
#   Message1.msg
#   Message2.msg
# )

## Generate services in the 'srv' folder
# add_service_files(
#   FILES
#   Service1.srv
#   Service2.srv
# )

## Generate actions in the 'action' folder
# add_action_files(
#   FILES
#   Action1.action
#   Action2.action
# )

## Generate added messages and services with any dependencies listed here
# generate_messages(
#   DEPENDENCIES
#   std_msgs  # Or other packages containing msgs
# )

################################################
## Declare ROS dynamic reconfigure parameters ##
################################################

## To declare and build dynamic reconfigure parameters within this
## package, follow these steps:
## * In the file package.xml:
##   * add a build_depend and a run_depend tag for "dynamic_reconfigure"
## * In this file (CMakeLists.txt):
##   * add "dynamic_reconfigure" to
##     find_package(catkin REQUIRED COMPONENTS ...)
##   * uncomment the "generate_dynamic_reconfigure_options" section below
##     and list every .cfg file to be processed

## Generate dynamic reconfigure parameters in the 'cfg' folder
# generate_dynamic_reconfigure_options(
#   cfg/DynReconf1.cfg
#   cfg/DynReconf2.cfg
# )

###################################
## catkin specific configuration ##
###################################
## The catkin_package macro generates cmake config files for ...