https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84257
--- Comment #3 from 191919 <191919 at gmail dot com> --- In macOS 10.12.6 with SIP disabled, the value of DYLD_LIBRARY_PATH was modified to the same as in macOS 10.13.3, but the compilation speed was not affected. I guess this is a regression of macOS code to handle DYLD_LIBRARY_PATH in an SIP-disabled environment. Long since OS X El Capitan which introduced SIP (aka rootless), DYLD_LIBRARY_PATH was practically screened and no one complained about it, I think it is safe to say that the line #3 of the following code taken from configure.ac of gcc is not necessary and can be removed. 1 | case "${host}" in 2 | *-*-hpux*) RPATH_ENVVAR=SHLIB_PATH ;; 3 | *-*-darwin*) RPATH_ENVVAR=DYLD_LIBRARY_PATH ;; 4 | *-*-mingw* | *-*-cygwin ) RPATH_ENVVAR=PATH ;; 5 | *) RPATH_ENVVAR=LD_LIBRARY_PATH ;; 6 | esac