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have_var-i.ri
U:RDoc::AnyMethod[iI" have_var:ETI"MakeMakefile#have_var;TF:publico:RDoc::Markup::Document:@parts[ o:RDoc::Markup::Paragraph; [ I"JReturns whether or not the variable +var+ can be found in the common ;TI"Pheader files, or within any +headers+ that you provide. If found, a macro ;TI"Mis passed as a preprocessor constant to the compiler using the variable ;TI"0name, in uppercase, prepended with +HAVE_+.;To:RDoc::Markup::BlankLine o; ; [I"ITo check variables in an additional library, you need to check that ;TI"5library first using
have_library()
.;T@o; ; [I"JFor example, if
have_var('foo')
returned true, then the ;TI"C+HAVE_FOO+ preprocessor macro would be passed to the compiler.;T: @fileI"lib/mkmf.rb;T:0@omit_headings_from_table_of_contents_below000[ I"'(var, headers = nil, opt = "", &b);T@FI"MakeMakefile;TcRDoc::NormalModule00