Remove warning by not calling have_library after pkg_config #193
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pkg_config without the options arguments stores the result in the global
values.
Calling `pkg_config` and `have_library` causes -lffi to appear twice in
the LIBS variable in the resulting Makefile, and causes ld on macOS to
emit a warning:
$ bundle exec rake compile 2>&1 | grep warning:
ld: warning: ignoring duplicate libraries: '-lffi'
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pkg_config without the options arguments stores the result in the global values.
Calling
pkg_configandhave_librarycauses -lffi to appear twice in the LIBS variable in the resulting Makefile, and causes ld on macOS to emit a warning: