A few notes for my future post...
After installing Xymon (Hobbit) on a CentOS system I found that the graphs didn't contain any text. Very frustrating to say the least. I did the following to temporarily solve my problem, but this might become permanent.
Used the ldd tool to determine which rrdtool library was used
# ldd /usr/lib/xymon/server/bin/hobbitgraph.cgi
linux-gate.so.1 => (0xffffe000)
libpcre.so.0 => /lib/libpcre.so.0 (0xf7f5a000)
librrd.so.2 => /usr/lib/librrd.so.2 (0xf7f10000)
libpng12.so.0 => /usr/lib/libpng12.so.0 (0x004c4000)
librt.so.1 => /lib/librt.so.1 (0x00b9d000)
libc.so.6 => /lib/libc.so.6 (0x00a3b000)
libfreetype.so.6 => /usr/lib/libfreetype.so.6 (0x003ac000)
libz.so.1 => /usr/lib/libz.so.1 (0x0050a000)
libart_lgpl_2.so.2 => /usr/lib/libart_lgpl_2.so.2 (0xf7ef8000)
libm.so.6 => /lib/libm.so.6 (0x00bc3000)
libpthread.so.0 => /lib/libpthread.so.0 (0x00ba8000)
/lib/ld-linux.so.2 (0x00a1c000)
libpcre.so.0 => /lib/libpcre.so.0 (0xf7f5a000)
librrd.so.2 => /usr/lib/librrd.so.2 (0xf7f10000)
libpng12.so.0 => /usr/lib/libpng12.so.0 (0x004c4000)
librt.so.1 => /lib/librt.so.1 (0x00b9d000)
libc.so.6 => /lib/libc.so.6 (0x00a3b000)
libfreetype.so.6 => /usr/lib/libfreetype.so.6 (0x003ac000)
libz.so.1 => /usr/lib/libz.so.1 (0x0050a000)
libart_lgpl_2.so.2 => /usr/lib/libart_lgpl_2.so.2 (0xf7ef8000)
libm.so.6 => /lib/libm.so.6 (0x00bc3000)
libpthread.so.0 => /lib/libpthread.so.0 (0x00ba8000)
/lib/ld-linux.so.2 (0x00a1c000)
Then...I did a strings and grep to see what ttf file it references
# strings /usr/lib/librrd.so.2 |grep ttf
@/usr/share/rrdtool/fonts/DejaVuSansMono-Roman.ttf
"@/usr/share/rrdtool/fonts/DejaVuSansMono-Roman.ttf
@/usr/share/rrdtool/fonts/DejaVuSansMono-Roman.ttf
@/usr/share/rrdtool/fonts/DejaVuSansMono-Roman.ttf
@/usr/share/rrdtool/fonts/DejaVuSansMono-Roman.ttf
"@/usr/share/rrdtool/fonts/DejaVuSansMono-Roman.ttf
@/usr/share/rrdtool/fonts/DejaVuSansMono-Roman.ttf
@/usr/share/rrdtool/fonts/DejaVuSansMono-Roman.ttf
@/usr/share/rrdtool/fonts/DejaVuSansMono-Roman.ttf
File did not exist nor the directory it was referencing...need to go back and determine why this is.
Created directory as referenced above.
Grep'd for the "DejaVuSnasMono-Roman.ttf" font and didn't find it on the system. However I did find a very similar one named "DejaVuLGCSansMono.ttf and created a symbolic link to it for a test.
# ln -s /usr/share/fonts/dejavu-lgc/DejaVuLGCSansMono.ttf ./DejaVuSansMono-Roman.ttf