对于很多开源库，他们一般都提供automake的编译发布形式，也就是三步曲：./configure && make && make install。
gdb hello-world如下：
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flushthink@gentoo64 ~/work/libevent-2.0.21-stable/sample $ gdb hello-world
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GNU gdb (Gentoo 7.5.1 p2) 7.5.1
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Copyright (C) 2012 Free Software Foundation, Inc.
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License GPLv3+: GNU GPL version 3 or later <
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This is free software: you are free to change and redistribute it.
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There is NO WARRANTY, to the extent permitted by law. Type \"show copying\"
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and \"show warranty\" for details.
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This GDB was configured as \"x86_64-pc-linux-gnu\".
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For bug reporting instructions, please see:
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<
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\"/home/flushthink/work/libevent-2.0.21-stable/sample/hello-world\": not in executable format: File format not recognized
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(gdb)
file hello-world如下：
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flushthink@gentoo64 ~/work/libevent-2.0.21-stable/sample $ file hello-world
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hello-world: POSIX shell script, ASCII text executable
vim hello-world如下：
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flushthink@gentoo64 ~/work/libevent-2.0.21-stable/sample $ vim hello-world
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#! /bin/sh
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# hello-world - temporary wrapper script for .libs/hello-world
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# Generated by libtool (GNU libtool) 2.4.2
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#
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# The hello-world program cannot be directly executed until all the libtool
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# libraries that it depends on are installed.
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#
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# This wrapper script should never be moved out of the build directory.
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# If it is, it will not operate correctly.
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# Sed substitution that helps us do robust quoting. It backslashifies
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# metacharacters that are still active within double-quoted strings.
查automake在线文档发现：
-no-install Link an executable output-file that can't be installed and therefore doesn't need a wrapper script on systems that allow hardcoding of library paths. Useful if the program is only used in the build tree, e.g., for testing or generating other files.
得出了结论（可以./configure --help查看）：
./configure --disable-libevent-install && make
这样就可以直接调试了。
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