setenv(const char * name, const char * val, int overwrite)
{
uschar * s;
if (Ustrchr(name, '=')) return -1;
if (overwrite || !getenv(name))
setenv(const char * name, const char * val, int overwrite)
{
uschar * s;
if (Ustrchr(name, '=')) return -1;
if (overwrite || !getenv(name))