+ if test $ac_cv_have_decl_unsetenv = no; then
+ HAVE_DECL_UNSETENV=0
+ fi
+ for ac_func in unsetenv
+do :
+ ac_fn_c_check_func "$LINENO" "unsetenv" "ac_cv_func_unsetenv"
+if test "x$ac_cv_func_unsetenv" = x""yes; then :
+ cat >>confdefs.h <<_ACEOF
+#define HAVE_UNSETENV 1
+_ACEOF
+
+fi
+done
+
+ if test $ac_cv_func_unsetenv = no; then
+ HAVE_UNSETENV=0
+ else
+ HAVE_UNSETENV=1
+ { $as_echo "$as_me:${as_lineno-$LINENO}: checking for unsetenv() return type" >&5
+$as_echo_n "checking for unsetenv() return type... " >&6; }
+if test "${gt_cv_func_unsetenv_ret+set}" = set; then :
+ $as_echo_n "(cached) " >&6
+else
+ cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h. */
+
+#undef _BSD
+#define _BSD 1 /* unhide unsetenv declaration in OSF/1 5.1 <stdlib.h> */
+#include <stdlib.h>
+extern
+#ifdef __cplusplus
+"C"
+#endif
+int unsetenv (const char *name);
+
+int
+main ()
+{
+
+ ;
+ return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+ gt_cv_func_unsetenv_ret='int'
+else
+ gt_cv_func_unsetenv_ret='void'
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $gt_cv_func_unsetenv_ret" >&5
+$as_echo "$gt_cv_func_unsetenv_ret" >&6; }
+ if test $gt_cv_func_unsetenv_ret = 'void'; then
+
+$as_echo "#define VOID_UNSETENV 1" >>confdefs.h
+
+ REPLACE_UNSETENV=1
+ fi
+
+ { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether unsetenv obeys POSIX" >&5
+$as_echo_n "checking whether unsetenv obeys POSIX... " >&6; }
+if test "${gl_cv_func_unsetenv_works+set}" = set; then :
+ $as_echo_n "(cached) " >&6
+else
+ if test "$cross_compiling" = yes; then :
+ case "$host_os" in
+ # Guess yes on glibc systems.
+ *-gnu*) gl_cv_func_unsetenv_works="guessing yes" ;;
+ # If we don't know, assume the worst.
+ *) gl_cv_func_unsetenv_works="guessing no" ;;
+ esac
+
+else
+ cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h. */
+
+ #include <stdlib.h>
+ #include <errno.h>
+ extern char **environ;
+
+int
+main ()
+{
+
+ char entry1[] = "a=1";
+ char entry2[] = "b=2";
+ char *env[] = { entry1, entry2, NULL };
+ if (putenv ((char *) "a=1")) return 1;
+ if (putenv (entry2)) return 2;
+ entry2[0] = 'a';
+ unsetenv ("a");
+ if (getenv ("a")) return 3;
+ if (!unsetenv ("") || errno != EINVAL) return 4;
+ entry2[0] = 'b';
+ environ = env;
+ if (!getenv ("a")) return 5;
+ entry2[0] = 'a';
+ unsetenv ("a");
+ if (getenv ("a")) return 6;
+
+ ;
+ return 0;
+}
+_ACEOF
+if ac_fn_c_try_run "$LINENO"; then :
+ gl_cv_func_unsetenv_works=yes
+else
+ gl_cv_func_unsetenv_works=no
+fi
+rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext \
+ conftest.$ac_objext conftest.beam conftest.$ac_ext
+fi
+
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $gl_cv_func_unsetenv_works" >&5
+$as_echo "$gl_cv_func_unsetenv_works" >&6; }
+ case "$gl_cv_func_unsetenv_works" in
+ *yes) ;;
+ *)
+ REPLACE_UNSETENV=1
+ ;;
+ esac
+ fi
+
+ if test $HAVE_UNSETENV = 0 || test $REPLACE_UNSETENV = 1; then
+
+
+
+
+
+
+
+
+ gl_LIBOBJS="$gl_LIBOBJS unsetenv.$ac_objext"
+
+
+
+
+
+ fi
+
+
+
+
+
+ GNULIB_UNSETENV=1
+
+
+
+
+
+
+
+