ehlo,
Manual pages were not cleaned by default.
They were cleaned in make distcheck because USE_NLS was enabled.
Reproducer:
cd src/man
make
make clean
# directory should contain generated manual pages
ls *.[1-8]
pam_sss.8 sssd_krb5_locator_plugin.8 sss_override.8
sss_cache.8 sssd-ldap.5 sss_rpcidmapd.5
sssd.8 sssd-simple.5 sss_seed.8
sssd-ad.5 sssd-sudo.5 sss_ssh_authorizedkeys.1
sssd.conf.5 sss_groupadd.8 sss_ssh_knownhostsproxy.1
sss_debuglevel.8 sss_groupdel.8 sss_useradd.8
sssd-ifp.5 sss_groupmod.8 sss_userdel.8
sssd-ipa.5 sss_groupshow.8 sss_usermod.8
sssd-krb5.5 sss_obfuscate.8
or alternative reproducer
make distcheck V=0 AUX_DISTCHECK_CONFIGURE_FLAGS=" --disable-nls"
LS