错误细节是这样的：

Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.

/Users/Levey/.rvm/rubies/ruby-1.9.3-p125/bin/ruby extconf.rb extconf.rb:10: Use RbConfig instead of obsolete and deprecated Config. checking for libxml/parser.h... yes checking for libxslt/xslt.h... yes checking for libexslt/exslt.h... yes checking for iconv_open() in iconv.h... no checking for iconv_open() in -liconv... yes checking for xmlParseDoc() in -lxml2... yes checking for xsltParseStylesheetDoc() in -lxslt... yes checking for exsltFuncRegister() in -lexslt... yes checking for xmlHasFeature()... yes checking for xmlFirstElementChild()... yes checking for xmlRelaxNGSetParserStructuredErrors()... yes checking for xmlRelaxNGSetParserStructuredErrors()... yes checking for xmlRelaxNGSetValidStructuredErrors()... yes checking for xmlSchemaSetValidStructuredErrors()... yes checking for xmlSchemaSetParserStructuredErrors()... yes creating Makefile

make compiling html_document.c make: gcc-4.2.1: No such file or directory make: *** [html_document.o] Error 1