patch 8.2.1570: configure check for dirfd() does not work on HPUX Commit: https://github.com/vim/vim/commit/9d8bfae50fdaf5f5ec6307c60ebd1fad0927c6be Author: Bram Moolenaar <Bram@vim.org> Date: Wed Sep 2 21:21:35 2020 +0200 patch 8.2.1570: configure check for dirfd() does not work on HPUX Problem: Configure check for dirfd() does not work on HPUX. (Michael Osipov) Solution: Use AC_TRY_LINK instead of AC_TRY_COMPILE. (closes https://github.com/vim/vim/issues/6838)

--- a/src/fileio.c
+++ b/src/fileio.c
@@ -24,6 +24,11 @@
 // Is there any system that doesn't have access()?
 #define USE_MCH_ACCESS
 
+#if defined(__hpux) && !defined(HAVE_DIRFD)
+# define dirfd(x) ((x)->__dd_fd)
+# define HAVE_DIRFD
+#endif
+
 static char_u *next_fenc(char_u **pp, int *alloced);
 #ifdef FEAT_EVAL
 static char_u *readfile_charconvert(char_u *fname, char_u *fenc, int *fdp);