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I'm try to build master on Fedora 32 beta with the following cmake command.

cmake .. -DCMAKE_INSTALL_PREFIX=/usr/local -DCMAKE_BUILD_TYPE=release

I get this build error:

[  3%] Building CXX object CMakeFiles/poppler.dir/poppler/DateInfo.cc.o
In file included from /usr/include/c++/10/cstring:42,
                 from /home/hub/source/poppler/poppler/DateInfo.cc:30:
/usr/include/string.h:346:14: error: conflicting declaration of ‘char* strtok_r(char*, const char*, char**)’ with ‘C’ linkage
  346 | extern char *strtok_r (char *__restrict __s, const char *__restrict __delim,
      |              ^~~~~~~~
In file included from /home/hub/source/poppler/poppler/DateInfo.cc:26:
/home/hub/source/poppler/goo/glibc.h:34:8: note: previous declaration with ‘C++’ linkage
   34 | char * strtok_r (char *s, const char *delim, char **save_ptr);
      |        ^~~~~~~~
make[2]: *** [CMakeFiles/poppler.dir/build.make:471: CMakeFiles/poppler.dir/poppler/DateInfo.cc.o] Error 1

It seems that CMake doesn't detect strtok_r.

I have no idea where to look into CMake to further diagnose the problem.