tar -xzf flex-2.5.4a.tar.gz cd flex-2.5.4a ./configure make sudo make install ⚠️ : Flex 2.5.4a is very old (circa 2006). Modern software typically uses Flex 2.6.x. Use this version only for legacy compatibility.

2.5.4a | Download Flex

tar -xzf flex-2.5.4a.tar.gz cd flex-2.5.4a ./configure make sudo make install ⚠️ : Flex 2.5.4a is very old (circa 2006). Modern software typically uses Flex 2.6.x. Use this version only for legacy compatibility.