I successfully built GHC-7.10.1 but I cannot run the tests (at least not when I follow the instructions at https://ghc.haskell.org/trac/ghc/wiki/Building/RunningTests). "make fast" fails like this: ===--- building phase 0 make -r --no-print-directory -f ghc.mk phase=0 phase_0_builds make[1]: Nothing to be done for `phase_0_builds'. ===--- building phase 1 make -r --no-print-directory -f ghc.mk phase=1 phase_1_builds make[1]: Nothing to be done for `phase_1_builds'. ===--- building final phase make -r --no-print-directory -f ghc.mk phase=final fast make[1]: *** No rule to make target `fast'. Stop. make: *** [fast] Error 2 "make testfast" fails in exactly the same way, except that the broken make target is "testfast" instead of fast. "make test" and "make fulltest" fail like this: make -C testsuite/tests CLEANUP=1 OUTPUT_SUMMARY=../../testsuite_summary.txt fast make[1]: Entering directory `/data/build.d/6.8/ghc-7.10.1/testsuite/tests' ../mk/boilerplate.mk:168: ../mk/ghcconfig_data_build.d_6.8_ghc-7.10.1_inplace_bin_ghc-stage2.mk: No such file or directory ../mk/ghc-config "/data/build.d/6.8/ghc-7.10.1/inplace/bin/ghc-stage2" >"../mk/ghcconfig_data_build.d_6.8_ghc-7.10.1_inplace_bin_ghc-stage2.mk"; if [ $? != 0 ]; then rm -f "../mk/ghcconfig_data_build.d_6.8_ghc-7.10.1_inplace_bin_ghc-stage2.mk"; exit 1; fi /bin/sh: ../mk/ghc-config: cannot execute binary file make[1]: *** [../mk/ghcconfig_data_build.d_6.8_ghc-7.10.1_inplace_bin_ghc-stage2.mk] Error 1 make[1]: Leaving directory `/data/build.d/6.8/ghc-7.10.1/testsuite/tests' make: *** [test] Error 2 Interestingly, for GHC-7.8.4 "make fast" and "make testfast" fail in exactly the same way but "make test" and "make fulltest" both work. So, how do I test GHC-7.10.1 ? Regards, Jeremy Henty