ISLEC is a typical GNU type software. All users can directly use ./configure & ./make command to compile the source code.
e.g. for version 1.1.2
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wget http://sourceforge.net/projects/islec/files/1.1.X/islec-1.1.2.tar.bz2/download
tar -xvf islec-1.1.2.tar.bz2
cd islec-1.1.2
./configure
./make
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For details, please see islec-X.X.X/INSTALL.