compiling Yade on centos 6

Hello
The system is: Linux - 2.6.32-754.6.3.el6.x86_64 - x86_64
CentOS release 6 (Final)
I have this problem with compiling YADE.
I don't know if the Loki error is related to the current situation.
echo $LOKI_LIBRARY
/opt/loki/loki-0.1.7/lib
echo $LOKI_INCLUDE_DIR
/opt/loki/loki-0.1.7/include/loki

-- Boost_VERSION: 106900
-- Boost_LIB_VERSION: 1_69
-- Boost_INCLUDE_DIRS: /opt/spack/opt/spack/linux-centos6-x86_64/gcc-4.7.0/boost-1.69.0-zpe6rz36tulbqq67p5dtqpuw7tq2ysdf/include
-- Boost_LIBRARIES: /usr/lib64/libboost_python-mt.so/usr/lib64/libboost_thread-mt.so-lpthread/usr/lib64/libboost_filesystem-mt.so/usr/lib64/libboost_iostreams-mt.so/usr/lib64/libboost_regex-mt.so/usr/lib64/libboost_serialization-mt.so/usr/lib64/libboost_system-mt.so/usr/lib64/libboost_date_time-mt.so
CMake Error at /opt/cmake/cmake-3.15.3-Linux-x86_64/share/cmake-3.15/Modules/FindPackageHandleStandardArgs.cmake:137 (message):
  Could NOT find Loki (missing: LOKI_INCLUDE_DIR LOKI_LIBRARY)
Call Stack (most recent call first):
  /opt/cmake/cmake-3.15.3-Linux-x86_64/share/cmake-3.15/Modules/FindPackageHandleStandardArgs.cmake:378 (_FPHSA_FAILURE_MESSAGE)
  cMake/FindLoki.cmake:14 (FIND_PACKAGE_HANDLE_STANDARD_ARGS)
  CMakeLists.txt:115 (FIND_PACKAGE)

-- Configuring incomplete, errors occurred!
See also "/opt/yade/myYade/trunk-2019.01a/CMakeFiles/CMakeOutput.log".

Determining if the function pthread_create exists in the pthread passed with the following output:
Change Dir: /opt/yade/myYade/trunk-2019.01a/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/gmake cmTC_94b7e/fast && /usr/bin/gmake -f CMakeFiles/cmTC_94b7e.dir/build.make CMakeFiles/cmTC_94b7e.dir/build
gmake[1]: Entering directory `/opt/yade/myYade/trunk-2019.01a/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_94b7e.dir/CheckFunctionExists.c.o
/usr/bin/cc -DCHECK_FUNCTION_EXISTS=pthread_create -o CMakeFiles/cmTC_94b7e.dir/CheckFunctionExists.c.o -c /opt/cmake/cmake-3.15.3-Linux-x86_$
Linking C executable cmTC_94b7e
/opt/cmake/cmake-3.15.3-Linux-x86_64/bin/cmake -E cmake_link_script CMakeFiles/cmTC_94b7e.dir/link.txt --verbose=1
/usr/bin/cc -DCHECK_FUNCTION_EXISTS=pthread_create -rdynamic CMakeFiles/cmTC_94b7e.dir/CheckFunctionExists.c.o -o cmTC_94b7e -lpthread
gmake[1]: Leaving directory `/opt/yade/myYade/trunk-2019.01a/CMakeFiles/CMakeTmp'
=======================================================================================

See also "/opt/yade/myYade/trunk-2019.01a/CMakeFiles/CMakeError.log".
Determining if the function pthread_create exists in the pthreads failed with the following output:
Change Dir: /opt/yade/myYade/trunk-2019.01a/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/gmake cmTC_a2567/fast && /usr/bin/gmake -f CMakeFiles/cmTC_a2567.dir/build.make CMakeFiles/cmTC_a2567.dir/build
gmake[1]: Entering directory `/opt/yade/myYade/trunk-2019.01a/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_a2567.dir/CheckFunctionExists.c.o
/usr/bin/cc -DCHECK_FUNCTION_EXISTS=pthread_create -o CMakeFiles/cmTC_a2567.dir/CheckFunctionExists.c.o -c /opt/cmake/cmake-3.15.3-Linux-x86_$
Linking C executable cmTC_a2567
/opt/cmake/cmake-3.15.3-Linux-x86_64/bin/cmake -E cmake_link_script CMakeFiles/cmTC_a2567.dir/link.txt --verbose=1
/usr/bin/cc -DCHECK_FUNCTION_EXISTS=pthread_create -rdynamic CMakeFiles/cmTC_a2567.dir/CheckFunctionExists.c.o -o cmTC_a2567 -lpthreads
/usr/bin/ld: cannot find -lpthreads
collect2: ld returned 1 exit status
gmake[1]: *** [cmTC_a2567] Error 1
gmake[1]: Leaving directory `/opt/yade/myYade/trunk-2019.01a/CMakeFiles/CMakeTmp'
gmake: *** [cmTC_a2567/fast] Error 2

=======================================================================================