[mythtv-users] How to compile mainserver.cpp?

[rsalern5 at optonline.net]

Hello all,

I'm running KnoppMyth 0.16 and would like to apply the patch to mainserver.cpp which fixes the infamous unreclaimed deleted disk space issue, found here: 

http://cvs.mythtv.org/cgi-bin/viewcvs.cgi/mythtv/programs/mythbackend/mainserver.cpp?r1=1.155&r2=1.156

Since the patch was only two lines, I manually edited mainserver.cpp.  Then I did the following, which failed miserably:

$ cd /usr/src/r4v5_src/mythtv-0.16/src/mythtv-0.16
$ ./configure
Please note that these settings only deal with libavcodec, not MythTV.
CPU              x86
Big Endian       no
MMX enabled      yes
Vector Builtins  yes
Creating config.mak and config.h
config.h is unchanged
$ qmake mythtv.pro
$ make
.
.
.
{standard input}:447: Error: symbol `m_drop_x' is already defined
{standard input}:453: Error: symbol `m_drop_y' is already defined
{standard input}:459: Error: symbol `m_force_x' is already defined
{standard input}:465: Error: symbol `m_force_y' is already defined
{standard input}:690: Error: symbol `scrollPosition' is already defined
make[2]: *** [dialogbox.o] Error 1
make[2]: Leaving directory `/usr/src/r4v5_src/mythtv-0.16/src/mythtv-0.16/libs/libmyth'
make[1]: *** [sub-libmyth] Error 2
make[1]: Leaving directory `/usr/src/r4v5_src/mythtv-0.16/src/mythtv-0.16/libs'
make: *** [sub-libs] Error 2
$

I guess I have two questions:

1) What did I screw up by doing this?
2) What's the right way to do this i.e. recompile mainserver.cpp and rebuild mythbackend?

Thanks,
    Russell