patch 8.0.1832: cannot use :unlet for an environment variablev8.0.1832

Problem:    Cannot use :unlet for an environment variable.
Solution:   Make it work.  Use unsetenv() if available. (Ken Takata,
            closes #2855)

1 files changed, 11 insertions, 0 deletions

diff --git a/src/misc1.c b/src/misc1.c
index 6c77f4b0d..1ab55f086 100644
--- a/src/misc1.c
+++ b/src/misc1.c
@@ -4479,6 +4479,17 @@ remove_tail(char_u *p, char_u *pend, char_u *name)
     return pend;
 }
 
+    void
+vim_unsetenv(char_u *var)
+{
+#ifdef HAVE_UNSETENV
+    unsetenv((char *)var);
+#else
+    mch_setenv((char *)var, "", 0);
+#endif
+}
+
+
 /*
  * Our portable version of setenv.
  */