attempt to use pkg-config to get include path for dependencies if not provided in env #525
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This is similar to alexcrichton/ssh2-rs#170 and solves issue in rust-lang/rust#69552
If dependencies include paths are not provided in environment (
DEP_SSH2_INCLUDE
,DEP_OPENSSL_INCLUDE
andDEP_Z_INCLUDE
) then the script attempts to usepkg_config
to find system-provided versions in order to buildlibgit2
.