6.41.2. Contents of Flex
Installed programs:
flex and lex
Installed libraries:
libfl.a and libfl_pic.a
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6.41. Flex-2.5.35
The Flex package contains a utility for generating programs that recognize patterns in text.
Approximate build time:
0.7 SBU
Required disk space:
28 MB
6.41.1. Installation of Flex
Apply a patch that fixes a bug in the C++ scanner generator, that causes scanner compilation to fail when using GCC-4.5.1:
patch -Np1 -i ../flex-2.5.35-gcc44-1.patch
Prepare Flex for compilation:
./configure --prefix=/usr
Compile the package:
make
To test the results (about 0.5 SBU), issue:
make check
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 -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
If desired, install the flex.pdf
documentation file:
mkdir -v /usr/share/doc/flex-2.5.35
cp -v doc/flex.pdf \
/usr/share/doc/flex-2.5.35