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libxml-ruby 3.1.0 install on macOS 10.15 Catalina

xml2homebrew などからインストールせずに、macOS 10.15 でOSのライブラリ(Xcode)を使ってlibxml-ruby gem をインストール

gem install

% gem install libxml-ruby -v '3.1.0' -- \
--with-xml2-dir=/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr \
--with-xml2-lib=/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/lib \
--with-xml2-include=/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/libxml2

bundle install

bundler を使う場合は --with-xml2-include だけでないとダメだった

% bundle config build.libxml-ruby --with-xml2-include=/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/libxml2
% bundle

libxml2 の場所は xml2-config --cflags で参照できる。
GCCなど用に -I フラグがついてしまうので、そのままでは使えないので今回は上記のようにベタがきにした。

% xml2-config --cflags
-I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/libxml2
% xml2-config --libs
-L/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/lib -lxml2 -lz -lpthread -licucore -lm

参考

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