several *.c files:

move 'extern environ' up to the location of #includes

coreutils/env.c

@@ -32,6 +32,7 @@
 #include "busybox.h"
 #include <errno.h>
 #include <getopt.h> /* struct option */
+extern char **environ;
 
 #if ENABLE_FEATURE_ENV_LONG_OPTIONS
 static const struct option env_long_options[] = {
@@ -49,7 +50,6 @@ int env_main(int argc, char** argv)
 	char **ep;
 	unsigned opt;
 	llist_t *unset_env = NULL;
-	extern char **environ;
 
 	opt_complementary = "u::";
 #if ENABLE_FEATURE_ENV_LONG_OPTIONS

coreutils/printenv.c

@@ -12,11 +12,11 @@
 #include <string.h>
 #include <stdlib.h>
 #include "busybox.h"
+extern char **environ;
 
 int printenv_main(int argc, char **argv);
 int printenv_main(int argc, char **argv)
 {
-	extern char **environ;
 	int e = 0;
 
 	/* no variables specified, show whole env */