I have typed "make all" in the source-directory:
[...]
/usr/bin/ppcx64 -Ur -Ur -Xs -n -Fi../inc -Fi../x86_64 -Fi../unix -Fix86_64 -FE. -FU/home/arthas/Downloads/fpc-2.0.1-050923.source/fpc/rtl/units/x86_64-linux -dx86_64 -dRELEASE ../unix/cthreads.pp
cthreads.pp(600,30) Error: Incompatible types: got "<address of function(Pointer, QWord, TThreadFunc, Pointer, LongWord,var LongInt):LongInt;Register>" expected "<procedure variable type of function(Pointer, LongWord, TThreadFunc, Pointer, LongWord,var Lo
cthreads.pp(646) Fatal: There were 1 errors compiling module, stopping
cthreads.pp(646) Error: Compilation aborted
make[7]: *** [cthreads.ppu] Fehler 1
make[7]: Leaving directory `/home/arthas/Downloads/fpc-2.0.1-050923.source/fpc/rtl/linux'
make[6]: *** [linux_all] Fehler 2
make[6]: Leaving directory `/home/arthas/Downloads/fpc-2.0.1-050923.source/fpc/rtl'
make[5]: ***
Fehler 2
make[5]: Leaving directory `/home/arthas/Downloads/fpc-2.0.1-050923.source/fpc/compiler'
make[4]: *** [next] Fehler 2
make[4]: Leaving directory `/home/arthas/Downloads/fpc-2.0.1-050923.source/fpc/compiler'
make[3]: *** [ppc1] Fehler 2
make[3]: Leaving directory `/home/arthas/Downloads/fpc-2.0.1-050923.source/fpc/compiler'
make[2]: *** [cycle] Fehler 2
make[2]: Leaving directory `/home/arthas/Downloads/fpc-2.0.1-050923.source/fpc/compiler'
make[1]: *** [compiler_cycle] Fehler 2
make[1]: Leaving directory `/home/arthas/Downloads/fpc-2.0.1-050923.source/fpc'
make: *** [build-stamp.x86_64-linux] Fehler 2