nsenter: use clearenv() only when it is available

Signed-off-by: Christian Goeschel Ndjomouo <cgoesc2@wgu.edu>

diff --git a/sys-utils/nsenter.c b/sys-utils/nsenter.c
index e10ba9cf90ab1950a7f486db12f477aa4a72bd52..245e1673e91f73d67bddfb3d562aa85cf14b0e78 100644 (file)
--- a/sys-utils/nsenter.c
+++ b/sys-utils/nsenter.c
@@ -37,6 +37,10 @@
 # include <selinux/selinux.h>
 #endif
 
+#ifndef HAVE_ENVIRON_DECL
+extern char **environ;
+#endif
+
 #include "strutils.h"
 #include "nls.h"
 #include "c.h"
@@ -912,7 +916,11 @@ int main(int argc, char *argv[])
                ls = env_list_from_fd(env_fd);
                if (!ls && errno)
                        err(EXIT_FAILURE, _("failed to get environment variables"));
+#ifdef HAVE_CLEARENV
                clearenv();
+#else
+               environ = NULL;
+#endif
                if (ls && env_list_setenv(ls, 0) < 0)
                        err(EXIT_FAILURE, _("failed to set environment variables"));
                env_list_free(ls);