cmake help

cmake_minimum_required(VERSION 3.4.1)

# now build app's shared lib
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11 -Wall")

add_library(gl2jni SHARED
            gl_code.cpp)

# add lib dependencies
target_link_libraries(gl2jni
                      android
                      log
                      EGL
                      GLESv2)

//works up to here -default created by Android studio when you select C/C++ support.

add_library(nmat SHARED
            nadMatrices.cpp)

# add lib dependencies
target_link_libraries(nmat
                      android
                      log
                      EGL
                      GLESv2)

//now when I try to use a function in my nadMatrices.cpp file, studio pics it up and can alt+enter automatically include "nadmatrices" but when I RUN, it fails to find it. -oh cause I didn't include nadMatrices.h?