Adjust CMakeLists to make dependency downloading optional

cmake/MatrixStructs.cmake

@@ -6,12 +6,10 @@ include(ExternalProject)
 
 set(THIRD_PARTY_ROOT ${CMAKE_SOURCE_DIR}/.third-party)
 set(MATRIX_STRUCTS_ROOT ${THIRD_PARTY_ROOT}/matrix_structs)
+set(MATRIX_STRUCTS_INCLUDE_DIR ${MATRIX_STRUCTS_ROOT}/include)
+set(MATRIX_STRUCTS_LIBRARY matrix_structs)
 
-set(MATRIX_STRUCTS_INCLUDE_DIRS ${MATRIX_STRUCTS_ROOT}/deps)
-
-include_directories(SYSTEM ${MATRIX_STRUCTS_ROOT}/deps)
-include_directories(SYSTEM ${MATRIX_STRUCTS_ROOT}/include)
-link_directories(${MATRIX_STRUCTS_ROOT}/lib)
+link_directories(${MATRIX_STRUCTS_ROOT})
 
 set(WINDOWS_FLAGS "")
 
@@ -23,17 +21,13 @@ ExternalProject_Add(
   MatrixStructs
 
   GIT_REPOSITORY https://github.com/mujx/matrix-structs
-  GIT_TAG 45e2671d9e5a5de46834c834e282da006f1689a0
+  GIT_TAG 91bb2b85a75d664007ef81aeb500d35268425922
 
   BUILD_IN_SOURCE 1
   SOURCE_DIR ${MATRIX_STRUCTS_ROOT}
   CONFIGURE_COMMAND ${CMAKE_COMMAND}
     -DCMAKE_BUILD_TYPE=Release ${MATRIX_STRUCTS_ROOT}
-    -DCMAKE_INSTALL_PREFIX=${MATRIX_STRUCTS_ROOT}
     ${WINDOWS_FLAGS}
   BUILD_COMMAND ${CMAKE_COMMAND} --build ${MATRIX_STRUCTS_ROOT} --config Release
-  INSTALL_COMMAND ${CMAKE_COMMAND}
-    --build ${MATRIX_STRUCTS_ROOT}
-    --config Release
-    --target install
+  INSTALL_COMMAND ""
 )