configure: WARNING: unrecognized options: --with-ld checking for gfind... no checking for find... /usr/bin/find checking for sort... /usr/bin/sort checking for GHC version date... given 8.3.20170831 checking for GHC Git commit id... inferred fca196280d38d07a697fbccdd8527821206b33eb checking for ghc... /usr/local/bin/ghc checking version of ghc... 7.10.2 configure: error: GHC version 8.0 or later is required to compile GHC.