Add a bit of documentation about the new multiple-USE_GITHUB.

[mat]

Create a sub-section inside USE_GITHUB to keep the multi-files thing to themselves.

[mat]

Shorten a title.

[mat]

• Extract USE_GITHUB from MASTER_SITES.

[wblock]

en_US.ISO8859-1/books/porters-handbook/makefiles/chapter.xml

1926–1927

s/The/the/

1927–1928

s/would end/ends/

1975

"similar to" is the more common way to say that.

It works in a way very similar to <xref

1981

Split the sentence:
<varname>GH_TAGNAME</varname>. Each different value is

1990

s/it contains/containing/

2023

Split up the sentence:
github. The default file comes from

2025

<literal>1.0.2</literal>. The second file, tagged

2028

<literal>1.0</literal>. The third file comes from

2036

An "are" is missing in this sentence, either "are extracted" here, or "are in their respective" in the next line.

2038

s/sub-directories/subdirectories/
"default one" is kind of vague, usually better to be specific, the "default file" or whatever.

2041

additional distribution file is extracted in its

2042

End sentence at the end of the line:
<varname>${WRKSRC_<replaceable>tag</replaceable>}</varname>.

2043

Here, the <literal>icons</literal> tag is called

2045

Split sentence:
<filename>${WRKDIR}/foo-icons-1.0</filename>. The file

[mat]

With @wblock's comments.

[wblock]

Looks good to me. #include $igor-build-note. :)

[pgollucci]

this makes sense to me.