The answer to this question is very simple: RPM_CHECK_LIB cannot provide those defines because for internal/embedded copies of a third-party library, RPM_CHECK_LIB cannot run the compile/link-time test at all (as those libraries will be build later the first time) during configure-time.
The answer to this question is very simple: RPM_CHECK_LIB cannot provide
those defines because for internal/embedded copies of a third-party
library, RPM_CHECK_LIB cannot run the compile/link-time test at
all (as those libraries will be build later the first time) during
configure-time.

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