undefined references when transfer to CMake

[AIBluefisher]

Hi, @iromu
I'm using your library of graclus recently, it goes well when I run make and I can get a executable file and two static libbraries.
However, when I use metis.a and multilevel.a to build my own program, problem occurs. I use the two libs and write a CMakeLists.txt:

---

cmake_minimum_required(VERSION 3.5)
project(TEST)

include_directories(/usr/include/graclus)
add_executable(graclus graclus.cpp io.cpp)
target_link_libraries(graclus metis multilevel)

---

error messages is below:

---

[ 66%] Linking CXX executable graclus
CMakeFiles/graclus.dir/graclus.cpp.o: In function normalizedCut()': graclus.cpp:(.text+0x10a): undefined reference to __log2_metis(int)'
graclus.cpp:(.text+0x146): undefined reference to __log2_metis(int)' graclus.cpp:(.text+0x1ba): undefined reference to __idxmalloc(int, char*)'
graclus.cpp:(.text+0x276): undefined reference to MLKKM_PartGraphKway(int*, int*, int*, int*, int*, int*, int*, int*, int*, int*, int*, int*, int)' graclus.cpp:(.text+0x2d9): undefined reference to __ComputePartitionBalance(graphdef*, int, int*, float*)'
graclus.cpp:(.text+0x2f8): undefined reference to ComputeNCut(graphdef*, int*, int)' graclus.cpp:(.text+0x394): undefined reference to __GKfree(void**, ...)'
CMakeFiles/graclus.dir/io.cpp.o: In function ReadGraph(graphdef*, char*, int*)': io.cpp:(.text+0x340): undefined reference to __InitGraph(graphdef*)'
io.cpp:(.text+0x5e0): undefined reference to __idxsmalloc(int, int, char*)' io.cpp:(.text+0x613): undefined reference to __idxmalloc(int, char*)'
io.cpp:(.text+0x652): undefined reference to __idxmalloc(int, char*)' io.cpp:(.text+0x692): undefined reference to __idxmalloc(int, char*)'
io.cpp:(.text+0x756): undefined reference to __errexit(char*, ...)' CMakeFiles/graclus.dir/io.cpp.o: In function WritePartition(char*, int*, int, int)':
io.cpp:(.text+0x99e): undefined reference to extractfilename(char*, char*)' io.cpp:(.text+0xa07): undefined reference to __errexit(char*, ...)'
CMakeFiles/graclus.dir/io.cpp.o: In function WriteMeshPartition(char*, int, int, int*, int, int*)': io.cpp:(.text+0xb2e): undefined reference to __errexit(char*, ...)'
io.cpp:(.text+0xbfc): undefined reference to __errexit(char*, ...)' CMakeFiles/graclus.dir/io.cpp.o: In function WritePermutation(char*, int*, int)':
io.cpp:(.text+0xd09): undefined reference to __errexit(char*, ...)' CMakeFiles/graclus.dir/io.cpp.o: In function ReadMesh(char*, int*, int*, int*)':
io.cpp:(.text+0x10b4): undefined reference to __errexit(char*, ...)' io.cpp:(.text+0x10ca): undefined reference to __idxmalloc(int, char*)'
io.cpp:(.text+0x1152): undefined reference to `__idxamax(int, int*)'
collect2: error: ld returned 1 exit status
CMakeFiles/graclus.dir/build.make:120: recipe for target 'graclus' failed
make[2]: *** [graclus] Error 1
CMakeFiles/Makefile2:67: recipe for target 'CMakeFiles/graclus.dir/all' failed
make[1]: *** [CMakeFiles/graclus.dir/all] Error 2
Makefile:83: recipe for target 'all' failed
make: *** [all] Error 2

---

and I found that the source directory doesn't contain header files, I think that's the reason. But why make command goes well? And how to write the right CMakeLists? May you help me.

Thank you very much!