In order to install xchm, i must install chmlib and wxbase and wxGTK, I install them all. and I try to run the configure script of xchm. but it can't find wx-config as follows:
[root@localhost xchm-0.9.1]# ./configure
checking whether make sets $(MAKE)... yes
checking for a BSD-compatible install... /usr/bin/install -c
checking for msgfmt... /usr/bin/msgfmt
checking for gmsgfmt... /usr/bin/msgfmt
checking for xgettext... /usr/bin/xgettext
checking for msgmerge... /usr/bin/msgmerge
checking for gcc... gcc
checking for C compiler default output... a.out
checking whether the C compiler works... yes
checking whether we are cross compiling... no
checking for suffix of executables...
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether gcc accepts -g... yes
checking for gcc option to accept ANSI C... none needed
checking build system type... i686-pc-linux-gnu
checking host system type... i686-pc-linux-gnu
checking for ld used by GCC... /usr/bin/ld
checking if the linker (/usr/bin/ld) is GNU ld... yes
checking for shared library run path origin... done
checking whether NLS is requested... yes
checking for GNU gettext in libc... yes
checking for wx-config... no
configure: error:
wxWidgets must be installed on your system
but the wx-config script couldn't be found.

Please check that wx-config is in path, the directory
where wxWidgets libraries are installed (returned by
'wx-config --libs' command) is in LD_LIBRARY_PATH or
equivalent variable and wxWidgets version is 2.3.4 or above.

I've search /usr/lib /usr/bin /usr/local/bin, but can't find wx-config. Where is it?