The Flex package contains a utility for generating programs that recognize patterns in text. &buildtime; &flex-time; &diskspace; &flex-compsize; &aa-flex-down; &aa-flex-dep;   Prepare Flex for compilation: ./configure --prefix=/usr Compile the package: make To have the results tested, issue: make bigcheck. And install the package: make install There are some packages that expect to find the lex library in /usr/lib. Create a symlink to account for this: ln -s libfl.a /usr/lib/libl.a A few programs don't know about flex yet and try to run its predecessor lex. To support those programs, create a wrapper script named lex that calls flex in lex emulation mode: cat > /usr/bin/lex << "EOF" #!/bin/sh # Begin /usr/bin/lex exec /usr/bin/flex -l "$@" # End /usr/bin/lex EOF chmod 755 /usr/bin/lex &aa-flex-shortdesc; &aa-flex-desc;