Comment 5 for bug 375604

The build proceeds now further, but fails at a different point now:

lex.o: In function `yyerror':
/tmp/buildd/mksh-38.1/build/small/../../mksh/lex.c:1045: undefined reference to `__builtin_stdarg_start'
main.o: In function `shellf':
/tmp/buildd/mksh-38.1/build/small/../../mksh/main.c:958: undefined reference to `__builtin_stdarg_start'
main.o: In function `internal_warningf':
/tmp/buildd/mksh-38.1/build/small/../../mksh/main.c:930: undefined reference to `__builtin_stdarg_start'
main.o: In function `warningf':
/tmp/buildd/mksh-38.1/build/small/../../mksh/main.c:866: undefined reference to `__builtin_stdarg_start'
main.o: In function `internal_errorf':
/tmp/buildd/mksh-38.1/build/small/../../mksh/main.c:919: undefined reference to `__builtin_stdarg_start'
main.o:/tmp/buildd/mksh-38.1/build/small/../../mksh/main.c:972: more undefined references to `__builtin_stdarg_start' follow
collect2: ld returned 1 exit status
make[1]: *** [do-build] Error 1
make[1]: Leaving directory `/tmp/buildd/mksh-38.1/build/small'
make: *** [debian/.build_stamp] Error 2

The build log also contains:
../../mksh/tree.c: In function 'fptreef':
../../mksh/tree.c:355: warning: implicit declaration of function '__builtin_stdarg_start'
(that's not the only one appearance of it)