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-rw-r--r--doc/manual.tex4
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diff --git a/doc/manual.tex b/doc/manual.tex
index e064e59e..59727099 100644
--- a/doc/manual.tex
+++ b/doc/manual.tex
@@ -59,9 +59,9 @@ make
sudo make install
\end{verbatim}
-Some other packages must be installed for the above to work. At a minimum, you need a standard UNIX shell, with standard UNIX tools like sed and GCC (or an alternate C compiler) in your execution path; MLton, the whole-program optimizing compiler for Standard ML; and the development files for the OpenSSL C library. As of this writing, in the ``testing'' version of Debian Linux, this command will install the more uncommon of these dependencies:
+Some other packages must be installed for the above to work. At a minimum, you need a standard UNIX shell, with standard UNIX tools like sed and GCC (or an alternate C compiler) in your execution path; MLton, the whole-program optimizing compiler for Standard ML; and the development files for the OpenSSL C library and the ICU C library. As of this writing, in the ``testing'' version of Debian Linux, this command will install the more uncommon of these dependencies:
\begin{verbatim}
-apt-get install mlton libssl-dev
+apt-get install mlton libssl-dev libicu-dev
\end{verbatim}
Note that, like the Ur/Web compiler, MLton is a whole-program optimizing compiler, so it frequently requires much more memory than old-fashioned compilers do. Expect building Ur/Web with MLton to require not much less than a gigabyte of RAM. If a \texttt{mlton} invocation ends suspiciously, the most likely explanation is that it has exhausted available memory.