Required extensions to build:
bash
submitqc
fltk-1.3-dev

Notes:
Patch applied (flCalc-0.99.1-1-compat) gcc 4.x compatible
Patch applied (flCalc-0.99.1-2-icon.patch) window icon
Patch applied (flCalc-0.99.1-3-bigsize) add double size button

Additional configure options:
  * NO CONFIGURE