The gitunsetenv function includes an (redundant) declaration of the
'environ' symbol, which is a pointer to the table of environment
variables. Unfortunately, on MinGW, this provokes sparse to issue
the following warning:

    compat/unsetenv.c:5:20: warning: non-ANSI function declaration of \
    function '__p__environ'

On MinGW, the <stdlib.h> header defines the 'environ' symbol as a
preprocessor macro (via _environ) which obtains the environ table
pointer via a call to the __p__environ() function.

In order to suppress the warning, we simply remove the redundant
declaration of the 'environ' symbol, since the symbol is already
declared correctly in <stdlib.h> (included via git-compat-util.h).

Signed-off-by: Ramsay Jones <>
 compat/unsetenv.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/compat/unsetenv.c b/compat/unsetenv.c
index eb29f5e..4ea1856 100644
--- a/compat/unsetenv.c
+++ b/compat/unsetenv.c
@@ -2,7 +2,6 @@
 void gitunsetenv (const char *name)
-     extern char **environ;
      int src, dst;
      size_t nmln;

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