The default gnome interface calculator gcalctools, source details, they can compile and run.

gcalctool-5.30.0.is.5.28.2
..........................\AUTHORS
..........................\COPYING
..........................\ChangeLog
..........................\ChangeLog-1990
..........................\ChangeLog-1991
..........................\ChangeLog-1992
..........................\ChangeLog-1993
..........................\ChangeLog-2002
..........................\INSTALL
..........................\MAINTAINERS
..........................\Makefile.am
..........................\Makefile.in
..........................\NEWS
..........................\README
..........................\acconfig.h
..........................\aclocal.m4
..........................\autogen.sh
..........................\config.guess
..........................\config.h.in
..........................\config.sub
..........................\configure
..........................\configure.in
..........................\data
..........................\....\Makefile.am
..........................\....\Makefile.in
..........................\....\financial.ui
..........................\....\gcalctool.1
..........................\....\gcalctool.desktop.in
..........................\....\gcalctool.schemas.in
..........................\....\gcalctool.ui
..........................\....\gcalctoolrc
..........................\debian
..........................\......\changelog
..........................\......\compat
..........................\......\control
..........................\......\control.in
..........................\......\copyright
..........................\......\gcalctool.menu
..........................\......\gcalctool.xpm
..........................\......\install
..........................\......\links
..........................\......\patches
..........................\......\.......\01_lpi.patch
..........................\......\.......\02_sqrt_crash.patch
..........................\......\rules
..........................\......\watch
..........................\depcomp
..........................\gnome-doc-utils.make
..........................\help
..........................\....\C
..........................\....\.\figures
..........................\....\.\.......\gcalctool_advanced_window.png
..........................\....\.\.......\gcalctool_basic_window.png
..........................\....\.\.......\gcalctool_financial_window.png
..........................\....\.\.......\gcalctool_menu_symbol.png
..........................\....\.\.......\gcalctool_programming_window.png
..........................\....\.\.......\gcalctool_scientific_window.png
..........................\....\.\gcalctool.xml
..........................\....\.\legal.xml
..........................\....\ChangeLog
..........................\....\Makefile.am
..........................\....\Makefile.in
..........................\....\bg
..........................\....\..\bg.po
..........................\....\..\figures
..........................\....\..\.......\gcalctool_advanced_window.png
..........................\....\..\.......\gcalctool_basic_window.png
..........................\....\..\.......\gcalctool_financial_window.png
..........................\....\..\.......\gcalctool_menu_symbol.png
..........................\....\..\.......\gcalctool_scientific_window.png
..........................\....\..\gcalctool.xml
..........................\....\ca
..........................\....\..\ca.po
..........................\....\..\figures
..........................\....\..\.......\gcalctool_advanced_window.png
..........................\....\..\.......\gcalctool_basic_window.png
..........................\....\..\.......\gcalctool_financial_window.png
..........................\....\..\.......\gcalctool_menu_symbol.png
..........................\....\..\.......\gcalctool_scientific_window.png
..........................\....\..\gcalctool.xml
..........................\....\cs
..........................\....\..\cs.po
..........................\....\..\figures
..........................\....\..\.......\gcalctool_basic_window.png
..........................\....\..\.......\gcalctool_scientific

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