Ganttproject is too simple to work on a sub-project. (It may be that I will not use, and later found to use indentation on it.). and then I searched the internet again, and found planner in line with my thoughts.
...
* Into the official website, download.
#tar XVJF Plann*.tar.xz
#cd plann*
#./configure
............................
Using $ (sysconfdir)/gconf/schemas as install directory for schema files
Checking whether to build Gtk-doc documentation ... no
Checking for Gtkdoc-check .../usr/bin/gtkdoc-check
Checking for PLANNER ... configure:error:Package requirements (
glib-2.0 >= 2.6.0
gobject-2.0 gmodule-2.0
gtk+-2.0 >= 2.14.0
libgnomecanvas-2.0 >= 2.10.0
libgnomeui-2.0 >= 2.10.0
libglade-2.0 >= 2.3.0
gconf-2.0 >= 2.10.0
) were not met:
No package ' libgnomecanvas-2.0 ' found
No package ' libgnomeui-2.0 ' found
No package ' libglade-2.0 ' found
No package ' gconf-2.0 ' found
Consider adjusting the PKG_CONFIG_PATH environment variable if you
Installed software in a non-standard prefix.
Alternatively, may set the environment variables Planner_cflags
and planner_libs to avoid the need-to-call pkg-config.
See the Pkg-config Mans page for more details.
...........
#yum-y Install libgnomecanvas-devel libgnomeui-devel
#./configure
# Make && make install
Ok
Progress management Tool Planner