make cross fails due to libchill

[Joern Rennecke]

I tried both to configure with --disable-chill and building with
LANGUAGES='c c++', but to no avail.  The build dies with:

make[2]: Entering directory `/x/egcs-sh/sh-hms/libchill'
/x/egcs-sh/gcc/xgcc -B/x/egcs-sh/gcc/ -B/usr/local/sh-hms/bin/ -c -I. -I/s/egcs/libchill   -g -O2  /s/egcs/libchill/basicio.c
/s/egcs/libchill/basicio.c: In function `makeName':
/s/egcs/libchill/basicio.c:83: `_POSIX_PATH_MAX' undeclared (first use in this function)
/s/egcs/libchill/basicio.c:83: (Each undeclared identifier is reported only once
/s/egcs/libchill/basicio.c:83: for each function it appears in.)
/s/egcs/libchill/basicio.c: In function `__modify':
/s/egcs/libchill/basicio.c:225: `_POSIX_PATH_MAX' undeclared (first use in this function)
make[2]: *** [basicio.o] Error 1
make[2]: Leaving directory `/x/egcs-sh/sh-hms/libchill'
make[1]: *** [all-target-libchill] Error 2
make[1]: Leaving directory `/x/egcs-sh'
make: *** [cross] Error 2