pearpc does not compile

SOURCE=1 -D_REENTRANT -MT file.o -MD -MP -MF ".deps/file.Tpo" -c -o
file.o file.cc; \                                         
        then mv -f ".deps/file.Tpo" ".deps/file.Po"; else rm -f
".deps/file.Tpo"; exit 1; fi                                  
if x86_64-pc-linux-gnu-g++ -DHAVE_CONFIG_H -I. -I. -I../.. -I ..
-march=nocona -O2 -pipe -Wundef -Wall -Woverloaded-virtual -fsigned-char
-fomit-frame-pointer -g -fno-inline -D_LARGEFILE_SOURCE
-D_FILE_OFFSET_BITS=64 -pipe -I/usr/include/SDL -D_GNU_SOURCE=1
-D_REENTRANT -MT vt100.o -MD -MP -MF ".deps/vt100.Tpo" -c -o vt100.o
vt100.cc; \                                     
        then mv -f ".deps/vt100.Tpo" ".deps/vt100.Po"; else rm -f
".deps/vt100.Tpo"; exit 1; fi                               
file.cc: In function ‘int sys_basename(char*, const
char*)’:                                                                  
file.cc:130: error: invalid conversion from ‘const char*’ to
‘char*’                                                          
file.cc:131: error: invalid conversion from ‘const char*’ to
‘char*’                                                          
file.cc: In function ‘int sys_dirname(char*, const
char*)’:                                                                   
file.cc:146: error: invalid conversion from ‘const char*’ to
‘char*’                                                          
file.cc:147: error: invalid conversion from ‘const char*’ to
‘char*’                                                          
file.cc: In function ‘char* sys_filename_suffix(const
char*)’:                                                                
file.cc:274: error: invalid conversion from ‘const char*’ to
‘char*’                                                          
if x86_64-pc-linux-gnu-g++ -DHAVE_CONFIG_H -I. -I. -I../.. -I ..
-march=nocona -O2 -pipe -Wundef -Wall -Woverloaded-virtual -fsigned-char