patch 8.0.1841: HP-UX does not have setenv() commit https://github.com/vim/vim/commit/1af6a4b891abd30f6bd09b15fb609e5db450392e Author: Bram Moolenaar <Bram@vim.org> Date: Mon May 14 22:58:34 2018 +0200 patch 8.0.1841: HP-UX does not have setenv() Problem: HP-UX does not have setenv(). Solution: Use vim_setenv(). (John Marriott)

--- a/src/misc1.c
+++ b/src/misc1.c
@@ -4485,7 +4485,7 @@ vim_unsetenv(char_u *var)
 #ifdef HAVE_UNSETENV
     unsetenv((char *)var);
 #else
-    mch_setenv((char *)var, "", 0);
+    vim_setenv(var, (char_u *)"");
 #endif
 }