mingw64-x86_64-libidn-1.39-41-test-failures.log Cygwin "native" x86_64, i686 and mingw64-i686 cross build tests all succeed from 1.38-1.41. Cygwin mingw64-x86_64 cross build tests succeed for 1.38 but two fail from 1.39-1.41. The two failing Cygwin mingw64-x86_64 cross build tests are tst_stringprep and tst_idna. Failing test code and data are shown following the failure summaries below. Obvious suspects were adding codeset.m4 and AM_LANGINFO_CODESET but removing latter then former did not fix the issue. $ grep -iC5 '\