[GitHub] trafficserver issue #1507: Add pkg-config fallback to --enable-system-luajit

[postwait <gi...@git.apache.org>]

GitHub user postwait opened an issue:

    https://github.com/apache/trafficserver/issues/1507

    Add pkg-config fallback to --enable-system-luajit

    The `--enable-system-luajit` configure option trusts that the invoker has set CPPFLAGS and LDFLAGS appropriately for autoconf to find the luajit headers and libraries.  If they are not found, *as a fallback* pkg-config should be invoked to ask the system to provide assistance and the headers and libs should be rechecked.
    
    pkg-config should not be invoked if the operator has provided sufficient information in CPPFLAGS and LDFLAGS for the AC_CHECK_HEADER and AC_CHECK_LIB checks to pass without the use of pkg-config.

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