Added install_target_output_folder option to matlab cmake scripts.

dlib/matlab/CMakeLists.txt

@@ -7,6 +7,11 @@ include(cmake_mex_wrapper)
 
 add_subdirectory(.. dlib_build)
 
+
+# You can tell cmake where to put the mex files when you run 'make install' by
+# setting this variable.  The path is relative to this CMakeLists.txt file.
+set(install_target_output_folder .)
+
 # Compile the example_mex_function.cpp file and link it to dlib.  Note
 # that you can give a list of things to link to here.  E.g. 
 #    add_mex_function(some_other_mex_function pthread dlib fftw) 

dlib/matlab/cmake_mex_wrapper

@@ -93,7 +93,11 @@ MACRO(add_mex_function name )
    endif()
    set_target_properties(${name} PROPERTIES PREFIX "")
    TARGET_LINK_LIBRARIES(${name} ${MATLAB_LIBRARIES} ${ARGN})
+   if (install_target_output_folder)
+      install(TARGETS ${name} DESTINATION "${install_target_output_folder}")
+   else()
       install(TARGETS ${name} DESTINATION "${install_dir}")
+   endif()
 ENDMACRO()