Compiling glibc on Ubuntu 18.04

I am trying to compile glibc on Ubuntu 18.04. I tried:

apt build-dep glibc
apt source glibc
cd glibc-2.27
debuild -b -uc -us

The build failed with 9 tests failures.

I’ve found out that there is a version 2.27-3ubuntu1.3 which is newer then what was downloaded with “apt source”.
apt source glibc=2.27-3ubuntu1.3 didn’t work, so I’ve downloaded and opened it manually.
This reduced the failures to 6. Here is the end of the log:

| Encountered regressions that don’t match expected failures. |
FAIL: nptl/test-condattr-printers
FAIL: nptl/test-cond-printers
FAIL: nptl/test-mutexattr-printers
FAIL: nptl/test-mutex-printers
FAIL: nptl/test-rwlockattr-printers
FAIL: nptl/test-rwlock-printers
debian/rules.d/ recipe for target ‘/pkgsrc/debian/glibc-2.27/stamp-dir/check_libc’ failed
make: *** [/pkgsrc/debian/glibc-2.27/stamp-dir/check_libc] Error 1
dpkg-buildpackage: error: debian/rules build subprocess returned exit status 2
debuild: fatal error at line 1152:
dpkg-buildpackage -rfakeroot -us -uc -ui -b failed

What could be the problem?


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