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From: Francois-Denis Gonthier <neumann@lostwebsite.net>
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Date: Thu, 20 Sep 2018 15:01:18 +0300
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Subject: [PATCH] Load man-pages from system-wide directory
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Patch allows one to use standard man path with erl -man command.
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(Erlang manual pages are placed to /usr/share/man/ hierarchy
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as required by Debian policy.)
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diff --git a/erts/etc/common/erlexec.c b/erts/etc/common/erlexec.c
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index 9a2488c93c..b0e46745db 100644
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--- a/erts/etc/common/erlexec.c
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+++ b/erts/etc/common/erlexec.c
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@@ -726,8 +726,10 @@ int main(int argc, char **argv)
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 			error("-man not supported on Windows");
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 #else
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 			argv[i] = "man";
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-			erts_snprintf(tmpStr, sizeof(tmpStr), "%s/man", rootdir);
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-			set_env("MANPATH", tmpStr);
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+			/*
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+			* Conform to erlang-manpages content.
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+			*/
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+			putenv(strsave("MANSECT=3erl:1:5:7"));
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 			execvp("man", argv+i);
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 			error("Could not execute the 'man' command.");
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 #endif