Build ygraph in Archlinux

#steps to build in Archlinux x86_64 the package ygraph from
#http://cactuscode.org/documentation/visualization/yGraph/
#install svn, autoconf, gtk+ 2,
#the list is not extensive, check the source docs for any extra packages

$ svn co https://svn.cactuscode.org/VizTools/ygraph/trunk ygraph
$ cd ygraph
$ gettextize -c --no-changelog --intl
$ aclocal -I m4
$ autoreconf -i
$ ./configure

#edit src/Makefile
#modify line 187
CFLAGS = -g -O2
#to look like this
CFLAGS = -g -O2 -lm

#then
$ make

#you'll get an error when building the documentation, but the binary was succesfully built and is in
#src/  directory