/usr/bin/ld: cannot find -lmysqlclient
collect2: ld returned 1 exit status
rm -f .libs/proftpdS.o
make: *** [proftpd] Error 1

I don't know the original redhat packages. But I can google and find this
http://dag.wieers.com/rpm/packages/proftpd/

There you have a packegae proftpd and a package proftpd-mysql

So please check what the distribution is offering!

I have successfully installed the proftpd-mysql, but proftpd services still will not boot.

Apr 26 00:12:59 4803 proftpd: - warning: handling possibly truncated configuration data at line 1 of '/ etc / proftpd / modules.conf'
Apr 26 00:12:59 4803 proftpd: - Fatal: LoadModule: error loading module 'mod_sql_mysql.c': Permission denied on line 1 of '/ etc / proftpd / modules.conf'
Apr 26 00:12:59 4803 proftpd: proftpd startup failed

In the docu (/usr/share/doc/proftpd on your system...) you can read about this:

<IfModule mod_dso.c>
LoadModule mod_sql.c
LoadModule mod_sql_mysql.c
</IfModule>

Redhat does not seem to use the modules.conf - so maybe you remove this completely and remove the line "Include ...".
I hope you find more information about how to load the module in the docu which is installed. I don't have any redhat around.
Otherwise send a PM with SSH logins, so I can try to figure out - but please try it first by yourself!

I have tried, but failed.

I still try in.

>>> proftpd.conf# SQL authentication Dynamic Shared Object (DSO) loading
# See README.DSO and howto/DSO.html for more details.
<IfModule mod_dso.c>
LoadModule mod_sql.c
LoadModule mod_sql_mysql.c
</IfModule>

so.


Apr 26 15:52:23 4803 proftpd: - warning: the DisplayFirstChdir directive is deprecated and will be removed in a future release. Please use the DisplayChdir directive.
Apr 26 15:52:23 4803 proftpd: - Fatal: LoadModule: error loading module 'mod_sql_mysql.c': Permission denied on line 151 of '/etc/proftpd.conf'
Apr 26 15:52:23 4803 proftpd: proftpd startup failed

The warning is ok, but the fatal not.
Could you tell us what's in line 151 of proftpd.conf?

# SQL authentication Dynamic Shared Object (DSO) loading
# See README.DSO and howto/DSO.html for more details.
<IfModule mod_dso.c> (149)
LoadModule mod_sql.c (150)
LoadModule mod_sql_mysql.c (151)
</IfModule> (152)

read this
http://www.proftpd.org/docs/howto/DSO.html

I do not quite understand the English of this article.

In short, modules need to make it ?