Cmake Error Solarus

Determining if the pthread_create exist failed with the following output:
Change Dir: /tmp/yaourt-tmp-jan/aur-solarus/src/solarus-1.5.0/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/make" "cmTC_e893a/fast"
/usr/bin/make -f CMakeFiles/cmTC_e893a.dir/build.make CMakeFiles/cmTC_e893a.dir/build
make[1]: Verzeichnis „/tmp/yaourt-tmp-jan/aur-solarus/src/solarus-1.5.0/CMakeFiles/CMakeTmp“ wird betreten
Building C object CMakeFiles/cmTC_e893a.dir/CheckSymbolExists.c.o
/usr/bin/cc    -march=x86-64 -mtune=generic -O2 -pipe -fstack-protector-strong     -o CMakeFiles/cmTC_e893a.dir/CheckSymbolExists.c.o   -c /tmp/yaourt-tmp-jan/aur-solarus/src/solarus-1.5.0/CMakeFiles/CMakeTmp/CheckSymbolExists.c
Linking C executable cmTC_e893a
/usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_e893a.dir/link.txt --verbose=1
/usr/bin/cc  -march=x86-64 -mtune=generic -O2 -pipe -fstack-protector-strong     -Wl,-O1,--sort-common,--as-needed,-z,relro  CMakeFiles/cmTC_e893a.dir/CheckSymbolExists.c.o  -o cmTC_e893a -rdynamic
CMakeFiles/cmTC_e893a.dir/CheckSymbolExists.c.o: In function `main':
CheckSymbolExists.c:(.text.startup+0x6): undefined reference to `pthread_create'
collect2: Fehler: ld gab 1 als Ende-Status zurück
make[1]: *** [CMakeFiles/cmTC_e893a.dir/build.make:98: cmTC_e893a] Fehler 1
make[1]: Verzeichnis „/tmp/yaourt-tmp-jan/aur-solarus/src/solarus-1.5.0/CMakeFiles/CMakeTmp“ wird verlassen
make: *** [Makefile:126: cmTC_e893a/fast] Fehler 2

File /tmp/yaourt-tmp-jan/aur-solarus/src/solarus-1.5.0/CMakeFiles/CMakeTmp/CheckSymbolExists.c:
/* */
#include <pthread.h>

int main(int argc, char** argv)
{
  (void)argv;
#ifndef pthread_create
  return ((int*)(&pthread_create))[argc];
#else
  (void)argc;
  return 0;
#endif
}

Determining if the function pthread_create exists in the pthreads failed with the following output:
Change Dir: /tmp/yaourt-tmp-jan/aur-solarus/src/solarus-1.5.0/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/make" "cmTC_992f7/fast"
/usr/bin/make -f CMakeFiles/cmTC_992f7.dir/build.make CMakeFiles/cmTC_992f7.dir/build
make[1]: Verzeichnis „/tmp/yaourt-tmp-jan/aur-solarus/src/solarus-1.5.0/CMakeFiles/CMakeTmp“ wird betreten
Building C object CMakeFiles/cmTC_992f7.dir/CheckFunctionExists.c.o
/usr/bin/cc    -march=x86-64 -mtune=generic -O2 -pipe -fstack-protector-strong  -DCHECK_FUNCTION_EXISTS=pthread_create   -o CMakeFiles/cmTC_992f7.dir/CheckFunctionExists.c.o   -c /usr/share/cmake-3.6/Modules/CheckFunctionExists.c
Linking C executable cmTC_992f7
/usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_992f7.dir/link.txt --verbose=1
/usr/bin/cc  -march=x86-64 -mtune=generic -O2 -pipe -fstack-protector-strong  -DCHECK_FUNCTION_EXISTS=pthread_create   -Wl,-O1,--sort-common,--as-needed,-z,relro  CMakeFiles/cmTC_992f7.dir/CheckFunctionExists.c.o  -o cmTC_992f7 -rdynamic -lpthreads
/usr/bin/ld: cannot find -lpthreads
collect2: Fehler: ld gab 1 als Ende-Status zurück
make[1]: *** [CMakeFiles/cmTC_992f7.dir/build.make:98: cmTC_992f7] Fehler 1
make[1]: Verzeichnis „/tmp/yaourt-tmp-jan/aur-solarus/src/solarus-1.5.0/CMakeFiles/CMakeTmp“ wird verlassen
make: *** [Makefile:126: cmTC_992f7/fast] Fehler 2