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6.32.1. Installation of Flex

First, fix a problem introduced with glibc-2.26:


sed -i "/math.h/a #include <malloc.h>" src/flexdef.h

sed -i "/math.h/a #include <malloc.h>" src/flexdef.h

The build procedure assumes the help2man program is available to create a man page from the executable --help option. This is not present, so we use an environment variable to skip this process. Now, prepare Flex for compilation:


HELP2MAN=/tools/bin/true

./configure --prefix=/usr --docdir=/usr/share/doc/flex-2.6.4

HELP2MAN=/tools/bin/true

./configure --prefix=/usr --docdir=/usr/share/doc/flex-2.6.4

Compile the package:


make

make

To test the results (about 0.5 SBU), issue:


make check

make check

Install the package:


make install

make install

A few programs do not know about flex yet and try to run its predecessor, lex. To support those programs, create a symbolic link named lex that runs flex in lex emulation mode:


ln -sv flex /usr/bin/lex

ln -sv flex /usr/bin/lex


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