At the beginning of this chapter you installed Glibc and applied a patch to it. Part of this patch was undoing some changes to make static binaries compiled against Glibc-2.2 work. However, this is not what the Glibc developers intended and we don't need to keep this modified Glibc around. So we reinstall Glibc here to remove this patch. A second reason to install Glibc again is because it's considered cleaner. The first Glibc was installed using programs compiled on your host distribution which sometimes has the effect of tainting Glibc. While this isn't a problem with the other packages compiled early in this chapter, for Glibc we want to be sure it's 100% OK (although feel free to reinstall other packages at this point so you can say you compiled an LFS system with LFS. Much like GCC's bootstrap installation method). We'll also install the linuxthreads man pages here. As you may recall, during the first installation of Glibc this wasn't possible because Perl wasn't installed yet. Everything we need to install the Glibc linuxthread man pages is present now, so we'll take care of this too now. Before starting to install glibc, you must cd into the glibc-&glibc-version; directory and unpack glibc-linuxthreads inside the glibc-&glibc-version; directory, not in /usr/src as you normally would do. This package is known to behave badly when you have changed its default optimization flags (including the -march and -mcpu options). Glibc is best left alone. Therefore, if you have defined any environment variables that override default optimizations, such as CFLAGS and CXXFLAGS, we recommend unsetting or modifying them when building Glibc. You have been warned. Basically, compiling Glibc in any other way than the book suggests is putting your system at very high risk. Install Glibc by running the following commands: mkdir ../glibc-build && cd ../glibc-build && ../glibc-&glibc-version;/configure --prefix=/usr --disable-profile \     --enable-add-ons --libexecdir=/usr/bin && make && make install && make -C ../glibc-&glibc-version;/linuxthreads/man && make -C ../glibc-&glibc-version;/linuxthreads/man install && exec /bin/bash --login