## An ACL action to add the given HDRS, which are a `\n'-terminated list of
## new header lines.
m4_define(<:ADD_HEADER:>, <:m4_dnl
- set acl_m_hdradd = ${if def:acl_m_hdradd{$acl_m_hdradd}{}}$1\n:>)
+set acl_m_hdradd = ${if def:acl_m_hdradd{$acl_m_hdradd}{}}$1\n:>)
## RENAME_HEADERS_ADD(list)
##