The KCalc Handbook: Installation

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### 2. Installation

### 2.1 How to obtain KCalc

KCalc is part of the KDE project http://www.kde.org. KCalc can be found on ftp://ftp.kde.org/pub/kde/, the main ftp site of the KDE project. It's home site is http://math.cornell.edu/~wuebben/kde.html

### 2.2 Requirements

In order to successfully compile KCalc, you need the latest versions of `libkdecore` and `libkdeui`. All required libraries as well as KCalc itself can be found on ftp://ftp.kde.org/pub/kde/.

### 2.3 Compilation and installation

The usual:

> `

>     % ./configure
>     % make
>     % make install

> `

IMPORTANT:

How to enable long double precision for KCalc:

If your machine supports the C data type 'long double' and if you have a working libc you can enable 'long double' precison for KCalc.

( RedHat 5.0 users are out of luck -- I suggest you get yourself a KDE friendly Linux distribution that has a working libc )

Here is what to do:

1. Check ../config.h and see whether HAVE_LONG_DOUBLE is defined, ie you should be able to locate a line saying:

   > `

   >     #define HAVE_LONG_DOUBLE 1

   > `

   If you can't find such a line your system doesn't support long double IEEE precision.

2. Edit the file kcalctype.h configdlg.cpp kcalc.cpp and kcalc_core.cpp and remove the lines

   > `

   >     #ifdef HAVE_LONG_DOUBLE
   >     #undef HAVE_LONG_DOUBLE
   >     #endif

   > `

3. recompile KCalc.

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