The m4/ directory below contains various m4 macros used
by different packages in the OpenWrt feed.
From GNU gettext:
Library linking and rpath helper macros.
  lib-ld.m4
  lib-link.m4
  lib-prefix.m4
Integer data type test macros.
  intmax.m4
  wint_t.m4
  inttypes-pri.m4
  uintmax_t.m4
  stdint_h.m4
  intdiv0.m4
  inttypes_h.m4
Program test macro.
  progtest.m4
GNU libc version test macros.
  glibc2.m4
  glibc21.m4
From UCL and LZO:
Compiler ACC conformance testing macros.
  mfx_acc.m4
  mfx_cppflags.m4
  mfx_limits.m4
From OSSP-JS:
Test macros for va_copy() implementations.
  va_copy.m4
From libmikmod:
Feature test macros for the Enlightment Sound Daemon.
  esd.m4
From libdnet:
Feature test macros for socket api implementations.
  dnet.m4
From FLAC:
XMMS feature detection macros.
  xmms.m4
From ao:
Directory expansion macro for Automake.
  as-ac-expand.m4
From tinyproxy:
Autostars m4 macro for detection of compiler flags.
  as-compiler-flags.m4
From morituri:
Autostars m4 macro for versioning.
  as-version.m4
From liboil:
Check if unaligned memory access works correctly.
  as-unaligned-access.m4
From OpenWrt:
Always disable GTK docs.
  fake-gtk-doc-check.m4
Provide intltool.m4 stubs to allow for autoreconf.
  fake-intltool.m4
From XDM:
XAW macros.
  xaw.m4