The Flex package contains a utility for generating programs that recognize patterns in text.
Flex contains several known bugs. Fix these with the following patch:
patch -Np1 -i ../flex-2.5.31-debian_fixes-3.patch
The GNU autotools detects that the Flex source code has been modified by the previous patch and tries to update the man page accordingly. This does not work correctly on many systems, and the default page is fine, so make sure it does not get regenerated:
Prepare Flex for compilation:
Compile the package:
To test the results, issue: make check.
Install the package:
There are some packages that expect to find the lex library in /usr/lib. Create a symlink to account for this:
ln -sv libfl.a /usr/lib/libl.a
A few programs do not 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 -v 755 /usr/bin/lex