have_var(var, headers = nil, opt = "", &b)
Instance Public methods
Returns whether or not the variable var
can be found in the
common header files, or within any headers
that you provide.
If found, a macro is passed as a preprocessor constant to the compiler
using the variable name, in uppercase, prepended with HAVE_
.
To check variables in an additional library, you need to check that library
first using have_library()
.
For example, if have_var('foo')
returned true, then
the HAVE_FOO
preprocessor macro would be passed to the
compiler.
Please login to continue.