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This is necessary in order to build epics-base with musl libc, for example, and any other C libraries which don't include this functionality. In order to not regress builds with older compilers, we still support the uclibc check. Furthermore, it has been checked that uclibc-ng (the maintained version of uclibc) doesn't install the <execinfo.h> header when the functionality is disabled [1] [2]. To avoid repetition, we don't define HAS_EXECINFO to 0 when it is not available. [1] https://cgit.uclibc-ng.org/cgi/cgit/uclibc-ng.git/tree/Makefile.in?id=cdb07d2cd52af39feb425e6d36c02b30916b9f0a#n224 [2] https://cgit.uclibc-ng.org/cgi/cgit/uclibc-ng.git/tree/Makefile.in?id=cdb07d2cd52af39feb425e6d36c02b30916b9f0a#n277