+ AC_CACHE_CHECK([whether drive letter can start relative path],
+ [ac_cv_drive_letter_can_be_relative],
+ [
+ AC_TRY_COMPILE([],
+ [#if defined __CYGWIN__
+drive letters are always absolute
+#endif],
+ [ac_cv_drive_letter_can_be_relative=yes],
+ [ac_cv_drive_letter_can_be_relative=no])
+ ])
+ if test x"$ac_cv_drive_letter_can_be_relative" = xyes; then
+ ac_fs_drive_letter_can_be_relative=1
+ else
+ ac_fs_drive_letter_can_be_relative=0
+ fi