Downloaded the debian file from source forge and followed instructions, where these errors appear, I re-downloaded the file several times with same error. I want to install the latest Gnucash not the one available on software center. Thank you for your support.

/qof/gnc-date/qof print date dmy buff:                               There are some differences between distros in the way they namelocales, and this can cause trouble with the locale-basedformatting. If you get the assert in this function, run locale -aand make sure that en_US, en_GB, and fr_FR are installed and thatif a suffix is needed it's in the suffixes array.**
ERROR:test-gnc-date.c:465:test_gnc_setlocale: code should not be reached
FAIL
GTester: last random seed: R02Sd8d3d0e67be954baa8ec75d81a14c0e3
/bin/bash: line 1: 18889 Terminated              MALLOC_CHECK_=2 MALLOC_PERTURB_=$((${RANDOM:-256} % 256)) gtester --verbose test-qof
make[5]: *** [test-nonrecursive] Error 143
make[5]: Leaving directory `/home/ahmed/gnucash/gnucash-2.6.3/src/libqof/qof/test'
make[4]: *** [check-am] Error 2
make[4]: Leaving directory `/home/ahmed/gnucash/gnucash-2.6.3/src/libqof/qof/test'
make[3]: *** [check-recursive] Error 1
make[3]: Leaving directory `/home/ahmed/gnucash/gnucash-2.6.3/src/libqof/qof'
make[2]: *** [check-recursive] Error 1
make[2]: Leaving directory `/home/ahmed/gnucash/gnucash-2.6.3/src/libqof'
make[1]: *** [check-recursive] Error 1
make[1]: Leaving directory `/home/ahmed/gnucash/gnucash-2.6.3/src'
make: *** [check-recursive] Error 1