Updating e2fsprogs for ext4 support

I'm getting an error when I "make"

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make[5]: Leaving directory `/home/janet/nios2-linux/uClinux-dist/user/e2fsprogs/build-e2fsprogs-1.41.12/intl'

make[5]: Entering directory `/home/janet/nios2-linux/uClinux-dist/user/e2fsprogs/build-e2fsprogs-1.41.12/intl'

make[5]: Nothing to be done for `install-shlibs'.

make[5]: Leaving directory `/home/janet/nios2-linux/uClinux-dist/user/e2fsprogs/build-e2fsprogs-1.41.12/intl'

making install in e2fsck

make[5]: Entering directory `/home/janet/nios2-linux/uClinux-dist/user/e2fsprogs/build-e2fsprogs-1.41.12/e2fsck'

CC ../../e2fsprogs-1.41.12/e2fsck/util.c

MKINSTALLDIRS //sbin /usr/share/man/man8

GEN /home/janet/nios2-linux/uClinux-dist/user/busybox/build-busybox/Makefile

Using /home/janet/nios2-linux/uClinux-dist/user/busybox/busybox as source for busybox

LD e2fsck

e2fsck.elf2flt(.text+0x12afc): In function `init_resource_track':

../../e2fsprogs-1.41.12/e2fsck/util.c:293: undefined reference to `sbrk'

e2fsck.elf2flt(.text+0x12c34): In function `print_resource_track':

../../e2fsprogs-1.41.12/e2fsck/util.c:358: undefined reference to `sbrk'

collect2: ld returned 1 exit status

make[5]: *** [e2fsck] Error 1

make[5]: Leaving directory `/home/janet/nios2-linux/uClinux-dist/user/e2fsprogs/build-e2fsprogs-1.41.12/e2fsck'

make[4]: *** [install-progs-recursive] Error 1

make[4]: Leaving directory `/home/janet/nios2-linux/uClinux-dist/user/e2fsprogs/build-e2fsprogs-1.41.12'

make[3]: *** [all] Error 2

make[3]: Leaving directory `/home/janet/nios2-linux/uClinux-dist/user/e2fsprogs'

make[2]: *** [e2fsprogs] Error 2

make[2]: *** Waiting for unfinished jobs....

make[4]: Leaving directory `/home/janet/nios2-linux/uClinux-dist/user/busybox/build-busybox'

make[3]: Leaving directory `/home/janet/nios2-linux/uClinux-dist/user/busybox'

make[2]: Leaving directory `/home/janet/nios2-linux/uClinux-dist/user'

make[1]: *** [all] Error 2

make[1]: Leaving directory `/home/janet/nios2-linux/uClinux-dist/user'

make: *** [subdirs] Error 1

[janet@localhost uClinux-dist]$

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How can I get "sbrk" linked correctly ?

Thanks in advance