-> install basic build dependencies:
$ tce-load -wi compiletc Xorg-7.7-dev fontconfig-dev

-> install additional build dependencies so that locale (nls) files can also be built:
$ tce-load -wi glibc_base-dev glibc_gconv glibc_apps

-> per TC wiki, for maximum compatibility:
$ export CFLAGS="-mtune=generic -Os -pipe"
$ export CXXFLAGS="-mtune=generic -Os -pipe"
$ export LDFLAGS="-Wl,-O1"

$ cd fluxbox-1.3.7
$ ./configure --prefix=/usr/local --enable-nls
$ make

-> copy some TCL-specific items from current fluxbox extension:
/etc/
/usr/local/tce.installed/
/usr/local/bin/fluxbox_initmenu
/usr/local/bin/fluxbox_makemenu
/usr/local/bin/fluxbox_menu_common
/usr/local/bin/fluxbox_ondemand
/usr/local/bin/fluxbox_restart
/usr/local/bin/fluxbox_rmitem
/usr/local/share/fluxbox/menu_template
/usr/local/share/fluxbox/tce.menu