我试图安装XML :: Parser ，但由于某种原因，它是失败的：
cpanm (App::cpanminus) 1.7040 on perl 5.022001 built for x86_64-linux-gnu-thread-multi Work directory is /root/.cpanm/work/1500726452.8458 You have make /usr/bin/make You have LWP 6.15 You have /bin/tar: tar (GNU tar) 1.28 Copyright (C) 2014 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Written by John Gilmore and Jay Fenlason. You have /usr/bin/unzip Searching XML::Parser () on cpanmetadb ... --> Working on XML::Parser Fetching http://www.cpan.org/authors/id/T/TO/TODDR/XML-Parser-2.44.tar.gz -> OK Unpacking XML-Parser-2.44.tar.gz Entering XML-Parser-2.44 Checking configure dependencies from META.json Checking if you have ExtUtils::MakeMaker 6.58 ... Yes (7.04_01) Configuring XML-Parser-2.44 Running Makefile.PL Expat must be installed prior to building XML::Parser and I can't find it in the standard library directories. Install 'expat-devel' (or 'libexpat1-dev') package with your OS package manager. See 'README'. Or you can download expat from: http://sourceforge.net/projects/expat/ If expat is installed, but in a non-standard directory, then use the following options to Makefile.PL: EXPATLIBPATH=... To set the directory in which to find libexpat EXPATINCPATH=... To set the directory in which to find expat.h For example: perl Makefile.PL EXPATLIBPATH=/home/me/lib EXPATINCPATH=/home/me/include Note that if you build against a shareable library in a non-standard location you may (on some platforms) also have to set your LD_LIBRARY_PATH environment variable at run time for perl to find the library. Checking if your kit is complete... Looks good Generating a Unix-style Makefile Writing Makefile for XML::Parser::Expat Writing MYMETA.yml and MYMETA.json Generating a Unix-style Makefile Writing Makefile for XML::Parser Writing MYMETA.yml and MYMETA.json -> OK Checking dependencies from MYMETA.json ... Checking if you have Test::More 0 ... Yes (1.302086) Checking if you have LWP::UserAgent 0 ... Yes (6.15) Building and testing XML-Parser-2.44 cp Parser/Encodings/big5.enc blib/lib/XML/Parser/Encodings/big5.enc cp Parser/Encodings/iso-8859-3.enc blib/lib/XML/Parser/Encodings/iso-8859-3.enc cp Parser/Encodings/windows-1255.enc blib/lib/XML/Parser/Encodings/windows-1255.enc cp Parser/Encodings/ibm866.enc blib/lib/XML/Parser/Encodings/ibm866.enc cp Parser/Encodings/iso-8859-8.enc blib/lib/XML/Parser/Encodings/iso-8859-8.enc cp Parser/Encodings/iso-8859-7.enc blib/lib/XML/Parser/Encodings/iso-8859-7.enc cp Parser/Encodings/README blib/lib/XML/Parser/Encodings/README cp Parser/Encodings/iso-8859-2.enc blib/lib/XML/Parser/Encodings/iso-8859-2.enc cp Parser/Encodings/x-euc-jp-unicode.enc blib/lib/XML/Parser/Encodings/x-euc-jp-unicode.enc cp Parser/LWPExternEnt.pl blib/lib/XML/Parser/LWPExternEnt.pl cp Parser/Style/Debug.pm blib/lib/XML/Parser/Style/Debug.pm cp Parser/Encodings/windows-1252.enc blib/lib/XML/Parser/Encodings/windows-1252.enc cp Parser/Style/Tree.pm blib/lib/XML/Parser/Style/Tree.pm cp Parser/Encodings/x-sjis-jisx0221.enc blib/lib/XML/Parser/Encodings/x-sjis-jisx0221.enc cp Parser/Encodings/x-euc-jp-jisx0221.enc blib/lib/XML/Parser/Encodings/x-euc-jp-jisx0221.enc cp Parser/Style/Objects.pm blib/lib/XML/Parser/Style/Objects.pm cp Parser/Encodings/x-sjis-unicode.enc blib/lib/XML/Parser/Encodings/x-sjis-unicode.enc cp Parser/Encodings/windows-1250.enc blib/lib/XML/Parser/Encodings/windows-1250.enc cp Parser/Encodings/Japanese_Encodings.msg blib/lib/XML/Parser/Encodings/Japanese_Encodings.msg cp Parser/Encodings/x-sjis-jdk117.enc blib/lib/XML/Parser/Encodings/x-sjis-jdk117.enc cp Parser/Encodings/iso-8859-4.enc blib/lib/XML/Parser/Encodings/iso-8859-4.enc cp Parser/Encodings/x-sjis-cp932.enc blib/lib/XML/Parser/Encodings/x-sjis-cp932.enc cp Parser/Encodings/koi8-r.enc blib/lib/XML/Parser/Encodings/koi8-r.enc cp Parser/Style/Stream.pm blib/lib/XML/Parser/Style/Stream.pm cp Parser/Encodings/iso-8859-5.enc blib/lib/XML/Parser/Encodings/iso-8859-5.enc cp Parser/Encodings/windows-1251.enc blib/lib/XML/Parser/Encodings/windows-1251.enc cp Parser/Style/Subs.pm blib/lib/XML/Parser/Style/Subs.pm cp Parser/Encodings/iso-8859-9.enc blib/lib/XML/Parser/Encodings/iso-8859-9.enc cp Parser.pm blib/lib/XML/Parser.pm cp Parser/Encodings/euc-kr.enc blib/lib/XML/Parser/Encodings/euc-kr.enc make[1]: Entering directory '/root/.cpanm/work/1500726452.8458/XML-Parser-2.44/Expat' cp Expat.pm ../blib/lib/XML/Parser/Expat.pm Running Mkbootstrap for XML::Parser::Expat () chmod 644 "Expat.bs" "/usr/bin/perl" "/usr/share/perl/5.22.1/ExtUtils/xsubpp" -noprototypes -typemap "/usr/share/perl/5.22/ExtUtils/typemap" -typemap "typemap" Expat.xs > Expat.xsc && mv Expat.xsc Expat.c x86_64-linux-gnu-gcc -c -D_REENTRANT -D_GNU_SOURCE -DDEBIAN -fwrapv -fno-strict-aliasing -pipe -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -O2 -g -DVERSION=\"2.44\" -DXS_VERSION=\"2.44\" -fPIC "-I/usr/lib/x86_64-$ Expat.xs:12:19: fatal error: expat.h: No such file or directory compilation terminated. Makefile:320: recipe for target 'Expat.o' failed make[1]: *** [Expat.o] Error 1 make[1]: Leaving directory '/root/.cpanm/work/1500726452.8458/XML-Parser-2.44/Expat' Makefile:595: recipe for target 'subdirs' failed make: *** [subdirs] Error 2 -> FAIL Installing XML::Parser failed. See /root/.cpanm/work/1500726452.8458/build.log for details. Retry with --force to force install it. 经过一番研究，我发现它需要“expat”，所以我已经使用apt-get安装了它：
apt-get install expat Reading package lists... Done Building dependency tree Reading state information... Done expat is already the newest version (2.1.0-7ubuntu0.16.04.3). 0 upgraded, 0 newly installed, 0 to remove and 150 not upgraded.
但是，即使重新运行后，我仍然得到这个错误（ locate Expat.o没有结果，即使在updatedb ）
我错过了什么？
为了得到你需要的库，你应该在输出中遵循这一行：
在你的OS软件包pipe理器中安装'expat-devel'（或'libexpat1-dev'）软件包。
只要expat不会让你需要链接的库。