Lines Matching refs:unsetenv

70   AC_CHECK_DECLS_ONCE([unsetenv])
74   AC_CHECK_FUNCS([unsetenv])
80     AC_CACHE_CHECK([for unsetenv() return type], [gt_cv_func_unsetenv_ret],
85 #define _BSD 1 /* unhide unsetenv declaration in OSF/1 5.1 <stdlib.h> */
91 int unsetenv (const char *name);
97       AC_DEFINE([VOID_UNSETENV], [1], [Define to 1 if unsetenv returns void
102     dnl Solaris 10 unsetenv does not remove all copies of a name.
103     dnl Haiku alpha 2 unsetenv gets confused by assignment to environ.
104     dnl OpenBSD 4.7 unsetenv("") does not fail.
105     AC_CACHE_CHECK([whether unsetenv obeys POSIX],
118        unsetenv ("a");
120        if (!unsetenv ("") || errno != EINVAL) return 4;
125        unsetenv ("a");
155 # Prerequisites of lib/unsetenv.c.