Fix & clean up the information about building Python with large file support
for Linux.
This closes SF bug #434975.
diff --git a/Doc/lib/libposix.tex b/Doc/lib/libposix.tex
index 0bb8173..9bbc336 100644
--- a/Doc/lib/libposix.tex
+++ b/Doc/lib/libposix.tex
@@ -62,10 +62,9 @@
On large-file-capable Linux systems, this might work:
\begin{verbatim}
-CC="-D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64"
-export CC
-./configure
-\end{verbatim}
+CFLAGS='-D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64' OPT="-g -O2 $CFLAGS" \
+ ./configure
+\end{verbatim} % $ <-- bow to font-lock
\subsection{Module Contents \label{posix-contents}}