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Linker error during build #1

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@peitl

I get this linker error during building (Ubuntu 18.04 Linux 4.15.0-33 CMake 3.10.2 GNU Make 4.1 GCC 7.3.0)

[ 40%] Built target cmsat
[ 42%] Built target sat_cryptominisat
[ 44%] Linking CXX executable quabs
libsolve/src/cmsat-prefix/src/cmsat-build/lib/libcryptominisat5.a(toplevelgauss.cpp.o): In function `CMSat::TopLevelGauss::TopLevelGauss(CMSat::Solver*)':
/home/peitl/quabs/build/libsolve/src/cmsat-prefix/src/cmsat/src/toplevelgauss.cpp:41: undefined reference to `m4ri_build_all_codes'
libsolve/src/cmsat-prefix/src/cmsat-build/lib/libcryptominisat5.a(toplevelgauss.cpp.o): In function `CMSat::TopLevelGauss::extractInfoFromBlock(std::vector<unsigned int, std::allocator<unsigned int> > const&, unsigned long)':
/home/peitl/quabs/build/libsolve/src/cmsat-prefix/src/cmsat/src/toplevelgauss.cpp:199: undefined reference to `mzd_init'
/home/peitl/quabs/build/libsolve/src/cmsat-prefix/src/cmsat/src/toplevelgauss.cpp:200: undefined reference to `mzd_is_zero'
/home/peitl/quabs/build/libsolve/src/cmsat-prefix/src/cmsat/src/toplevelgauss.cpp:224: undefined reference to `mzd_echelonize_pluq'
/home/peitl/quabs/build/libsolve/src/cmsat-prefix/src/cmsat/src/toplevelgauss.cpp:278: undefined reference to `mzd_free'
/home/peitl/quabs/build/libsolve/src/cmsat-prefix/src/cmsat/src/toplevelgauss.cpp:224: undefined reference to `mzd_echelonize_pluq'
collect2: error: ld returned 1 exit status
CMakeFiles/quabs.dir/build.make:98: recipe for target 'quabs' failed
make[2]: *** [quabs] Error 1
CMakeFiles/Makefile2:146: recipe for target 'CMakeFiles/quabs.dir/all' failed
make[1]: *** [CMakeFiles/quabs.dir/all] Error 2
Makefile:83: recipe for target 'all' failed
make: *** [all] Error 2

From some limited searching, I suspect the problem might be that CryptoMiniSat is linked dynamically, but QuAbS is trying to link statically against it, although I do not know whether that's really the case or how to fix it.

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