Compile error

[DuyguA]

I do a make and get the following error:

lmtable.cpp: In member function ‘virtual ngram_state_t irstlm::lmtable::cmaxsuffidx(ngram, unsigned int*)’:
lmtable.cpp:2406:28: error: invalid conversion from ‘const char*’ to ‘char*’ [-fpermissive]
   char* msptr = cmaxsuffptr(ong,&isize);
                            ^
lmtable.cpp:2407:33: error: ‘suffptr’ was not declared in this scope
   ngram_state_t msidx = convert(suffptr,isize);
                                 ^
lmtable.cpp:2415:14: error: ‘found’ was not declared in this scope
    pst.state=found;
              ^
lmtable.cpp:2406:9: warning: unused variable ‘msptr’ [-Wunused-variable]
   char* msptr = cmaxsuffptr(ong,&isize);
         ^
lmtable.cpp: In member function ‘void irstlm::lmtable::loadtxt_mmap(std::istream&, const char*, const char*)’:
lmtable.cpp:622:36: warning: ignoring return value of ‘int ftruncate(int, __off64_t)’, declared with attribute warn_unused_result [-Wunused-result]
      ftruncate(fileno(fd),filesize);
                                    ^
lmtable.cpp:724:14: warning: ignoring return value of ‘int system(const char*)’, declared with attribute warn_unused_result [-Wunused-result]
   system(cmd);
              ^
lmtable.cpp:728:14: warning: ignoring return value of ‘int system(const char*)’, declared with attribute warn_unused_result [-Wunused-result]
   system(cmd);
              ^
lmtable.cpp: In member function ‘void irstlm::lmtable::expand_level_mmap(int, table_entry_pos_t, const char*)’:
lmtable.cpp:887:33: warning: ignoring return value of ‘int ftruncate(int, __off64_t)’, declared with attribute warn_unused_result [-Wunused-result]
   ftruncate(fileno(fd),filesize);
                                 ^
lmtable.cpp: In member function ‘void irstlm::lmtable::concatenate_single_level(int, const char*, const char*)’:
lmtable.cpp:1785:14: warning: ignoring return value of ‘int system(const char*)’, declared with attribute warn_unused_result [-Wunused-result]
   system(cmd);
              ^
lmtable.cpp: In member function ‘void irstlm::lmtable::compact_single_level(int, const char*)’:
lmtable.cpp:1856:14: warning: ignoring return value of ‘int system(const char*)’, declared with attribute warn_unused_result [-Wunused-result]
   system(cmd);
              ^
lmtable.cpp: In member function ‘void irstlm::lmtable::resize_level_mmap(int, const char*)’:
lmtable.cpp:1889:33: warning: ignoring return value of ‘int ftruncate(int, __off64_t)’, declared with attribute warn_unused_result [-Wunused-result]
   ftruncate(fileno(fd),filesize);
                                 ^
lmtable.cpp: In member function ‘void irstlm::lmtable::loadbin(std::istream&, const char*, const char*, int)’:
lmtable.cpp:1996:29: warning: ignoring return value of ‘ssize_t read(int, void*, size_t)’, declared with attribute warn_unused_result [-Wunused-result]
    read(diskid,miniheader,4);
                             ^
Makefile:742: recipe for target 'lmtable.lo' failed
make[2]: *** [lmtable.lo] Error 1
make[2]: Leaving directory '/home/duygu/irstlm/src'
Makefile:407: recipe for target 'all-recursive' failed
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory '/home/duygu/irstlm'
Makefile:339: recipe for target 'all' failed
make: *** [all] Error 2

Any suggestion is appreciated, thanks in advance.

[alpoktem]

Having the same issue here on Ubuntu 18.04.