To compile KSquirrel from sources you need to install kde-devel package.
It will install all needed header files. In Mandriva or same systems
you should also install tdebase-devel package.

In Debian do

# apt-get install kde-devel

Then follow the installation instructions:

1. First install 'ksquirrel-libs' package:

   a) from sources
   # tar jxfv ksquirrel-libs-0.8.0.tar.bz2
   # cd ksquirrel-libs-0.8.0/
 * # su -c './required-etch'
   # ./configure.gnu
   # make
   # su -c 'make install'
   
   b) from binary packages
RPM  # rpm -ihv ksquirrel-libs-0.8.0.rpm
TGZ  # installpkg ksquirrel-libs-0.8.0.tgz
DEB  # dpkg -i ksquirrel-libs-0.8.0.deb

2. Now install KSquirrel:

   a) from sources
   # tar jxfv ksquirrel-0.8.0.tar.bz2
   # cd ksquirrel-0.8.0/
 * # su -c './required-etch'
   # ./configure.gnu
   # make
   # su -c 'make install'

* For Debian Etch and Ubuntu Feisty only.
  This will install all required packages with aptitude.

   b) from binary packages
RPM  # rpm -ihv ksquirrel-0.8.0.rpm
TGZ  # installpkg ksquirrel-0.8.0.tgz
DEB  # dpkg -i ksquirrel-0.8.0.deb

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Note: You can pass all regular 'configure' options to configure.gnu.
Note: You needn't specify --prefix, it's already done in configure.gnu.