after installation, you might have problem after type "xchm &" with below error message.
[root@localhost Desktop]# xchm
xchm: error while loading shared libraries: libchm.so.0: cannot open shared object file: No such file or directory
Solution:
#ln -s /usr/local/lib/libchm.so.0 /usr/lib/libchm.so.0
#ln -s /usr/lib/libwx_gtk-2.4.so.0 /usr/lib/libwx_gtk-2.4.so