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trouble building static lib & using it

shome (5)
I built a static lib to call a matlab function from C++. when i try to use it i
get many undefined referece errors. i had previously built a shared lib from the same source & it worked fine

my codes for the static lib(call_matlab_processing.a) generation:

call_matlab_processing.cpp
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#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "engine.h"
#include <iostream>

int call_matlab_processing(double array[],int sorted_indices[], int size_array)
{
	// its just a sorting algo, sorting being implemented by matlab

	double * sorted;
	double *indices;

	Engine *ep;
	mxArray *T = NULL, *result = NULL, *indices_matlab=NULL;
	if (!(ep = engOpen(""))) {
		fprintf(stderr, "\nCan't start MATLAB engine\n");
		return 1;
	}
	T = mxCreateDoubleMatrix(1,size_array, mxREAL);
	memcpy((void *)mxGetPr(T), (void *)array, size_array*sizeof(double));

	engPutVariable(ep, "T", T);
	engEvalString(ep, "[D,I] = sort(T,'descend')");
	engEvalString(ep, ";");
	engEvalString(ep, "figure,plot(D);");
	engEvalString(ep, "dlmwrite('myFile.txt',I)");
	result = engGetVariable(ep,"D");
	indices_matlab = engGetVariable(ep,"I");

	sorted=(double *)mxGetData(result);
	indices=(double *)mxGetData(indices_matlab);// casting as int * gave wrong results

	for(int i = 0; i < size_array;i++)
	{
		array[i]=*sorted;
		sorted_indices[i]=*indices;
		sorted++;
		indices++;
	}


	int goahead=fgetc(stdin);

	mxDestroyArray(T);
	mxDestroyArray(result);
	mxDestroyArray(indices_matlab);

	engEvalString(ep, "close;");
	engClose(ep);

	return 0;
}

call_matlab_processing.h
 
 
int call_matlab_processing(double array[],int sorted_indices[], int size_array);


cmakelists.txt for static lib generation:
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cmake_minimum_required(VERSION 2.8 FATAL_ERROR)

project(call_matlab_processing)
set(CMAKE_BUILD_TYPE Release)

set (PROJECT_LINK_LIBS libeng.so libmat.so libmx.so libut.so)
link_directories(/usr/local/MATLAB/R2014a/bin/glnxa64)

include_directories(/usr/local/MATLAB/R2014a/extern/include/ include)

add_library(call_matlab_processing STATIC src/call_matlab_processing.cpp)
target_link_libraries (call_matlab_processing ${PROJECT_LINK_LIBS})


when i use the created static lib in main i get undefined refernce errors.
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#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <iostream>
#define  BUFSIZE 256
#include <call_matlab_processing.h>

int main()
{
	int size_array=10;

	double array[10]={ 10, 5, 12, 27,127, 93, 1, 26, 58, 74 };
	int sorted_indices[10];

	int result=call_matlab_processing(array,sorted_indices,10);

	for (int i=0;i<10;i++)
	{
		std::cout << "sorted_array= " <<array[i]<< " indices="<< sorted_indices[i] <<std::endl;
	}

	std::cout << "Done"<< std::endl;
	return EXIT_SUCCESS;
}


my CmakeLists.txt for main
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cmake_minimum_required(VERSION 2.8 FATAL_ERROR)
project(matlab_sort_using_static)
set (PROJECT_LINK_LIBS libcall_matlab_processing.a)
link_directories(~/temp_codes/important_codes/build)

include_directories(~/temp_codes/important_codes/include)
add_executable (matlab_sort_using_static matlab_sort_using_static.cpp)
target_link_libraries (matlab_sort_using_static ${PROJECT_LINK_LIBS})

errors:

Building CXX object CMakeFiles/matlab_sort_using_static.dir/matlab_sort_using_static.cpp.o
/usr/bin/cmake: /usr/local/MATLAB/R2014a/bin/glnxa64/libcurl.so.4: no version information available (required by /usr/bin/cmake)
Linking CXX executable matlab_sort_using_static
/usr/bin/cmake: /usr/local/MATLAB/R2014a/bin/glnxa64/libcurl.so.4: no version information available (required by /usr/bin/cmake)
/home/shome/temp_codes/important_codes/build/libcall_matlab_processing.a(call_matlab_processing.cpp.o): In function `call_matlab_processing(double*, int*, int)':
call_matlab_processing.cpp:(.text+0x1d): undefined reference to `engOpen'
call_matlab_processing.cpp:(.text+0x43): undefined reference to `mxCreateDoubleMatrix'
call_matlab_processing.cpp:(.text+0x4f): undefined reference to `mxGetPr'
call_matlab_processing.cpp:(.text+0x6e): undefined reference to `engPutVariable'
call_matlab_processing.cpp:(.text+0x7b): undefined reference to `engEvalString'
call_matlab_processing.cpp:(.text+0x88): undefined reference to `engEvalString'
call_matlab_processing.cpp:(.text+0x95): undefined reference to `engEvalString'
call_matlab_processing.cpp:(.text+0xa2): undefined reference to `engEvalString'
call_matlab_processing.cpp:(.text+0xaf): undefined reference to `engGetVariable'
call_matlab_processing.cpp:(.text+0xc1): undefined reference to `engGetVariable'
call_matlab_processing.cpp:(.text+0xd0): undefined reference to `mxGetData'
call_matlab_processing.cpp:(.text+0xdf): undefined reference to `mxGetData'
call_matlab_processing.cpp:(.text+0x278): undefined reference to `mxDestroyArray'
call_matlab_processing.cpp:(.text+0x282): undefined reference to `mxDestroyArray'
call_matlab_processing.cpp:(.text+0x28c): undefined reference to `mxDestroyArray'
call_matlab_processing.cpp:(.text+0x299): undefined reference to `engEvalString'
call_matlab_processing.cpp:(.text+0x2a1): undefined reference to `engClose'
collect2: error: ld returned 1 exit status
make[2]: *** [matlab_sort_using_static] Error 1


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