diff --git a/m4/ax_check_al.m4 b/m4/ax_check_al.m4
index 61f75114..7607118d 100644
--- a/m4/ax_check_al.m4
+++ b/m4/ax_check_al.m4
@@ -1,6 +1,7 @@
+#serial 1000
 dnl @synopsis AX_CHECK_AL(action-if, action-if-not)
 dnl
-dnl @summary check for OpenAL or OpenAL Soft.
+dnl @summary check for OpenAL Soft.
 dnl
 dnl Defines AL_LIBS, AL_CFLAGS.
 dnl
@@ -10,8 +11,8 @@ dnl @version 2013-12-14
 dnl @license Creative Commons CC0 1.0 Universal Public Domain Dedication
 
 AC_DEFUN([AX_CHECK_AL], [
-	AC_ARG_VAR(AL_CFLAGS, [C compiler flags for OpenAL or OpenAL Soft])
-	AC_ARG_VAR(AL_LIBS, [libraries to pass to the linker for OpenAL or OpenAL Soft])
+	AC_ARG_VAR(AL_CFLAGS, [C compiler flags for OpenAL Soft])
+	AC_ARG_VAR(AL_LIBS, [libraries to pass to the linker for OpenAL Soft])
 
 	case "$target" in
 		*darwin*)
diff --git a/m4/ax_check_iconv.m4 b/m4/ax_check_iconv.m4
index 2e7c2ff5..9821f75a 100644
--- a/m4/ax_check_iconv.m4
+++ b/m4/ax_check_iconv.m4
@@ -1,3 +1,4 @@
+#serial 1000
 dnl @synopsis AX_CHECK_ICONV(action-if, action-if-not)
 dnl
 dnl @summary check for a useable iconv() function
diff --git a/m4/ax_check_lzma.m4 b/m4/ax_check_lzma.m4
index ae11f8d6..730a7e44 100644
--- a/m4/ax_check_lzma.m4
+++ b/m4/ax_check_lzma.m4
@@ -1,3 +1,4 @@
+#serial 1000
 dnl @synopsis AX_CHECK_LZMA(major, minor, patch, stability, action-if, action-if-not)
 dnl
 dnl @summary check for LZMA of sufficient major, minor, patch and stability version
diff --git a/m4/ax_check_mad.m4 b/m4/ax_check_mad.m4
index 128e627a..d897752a 100644
--- a/m4/ax_check_mad.m4
+++ b/m4/ax_check_mad.m4
@@ -1,3 +1,4 @@
+#serial 1000
 dnl @synopsis AX_CHECK_MAD(major, minor, patch, action-if, action-if-not)
 dnl
 dnl @summary check for MAD of sufficient major, minor and patch version
diff --git a/m4/ax_check_ogg.m4 b/m4/ax_check_ogg.m4
index d5503c23..6de71ec0 100644
--- a/m4/ax_check_ogg.m4
+++ b/m4/ax_check_ogg.m4
@@ -1,3 +1,4 @@
+#serial 1000
 dnl @synopsis AX_CHECK_OGG(action-if, action-if-not)
 dnl
 dnl @summary check for libOgg
diff --git a/m4/ax_check_vorbis.m4 b/m4/ax_check_vorbis.m4
index 0fb5526a..61ae64d6 100644
--- a/m4/ax_check_vorbis.m4
+++ b/m4/ax_check_vorbis.m4
@@ -1,3 +1,4 @@
+#serial 1000
 dnl @synopsis AX_CHECK_VORBIS(action-if, action-if-not)
 dnl
 dnl @summary check for libVorbisFile
diff --git a/m4/ax_check_wx.m4 b/m4/ax_check_wx.m4
index 8bde9ea8..f1735eb1 100644
--- a/m4/ax_check_wx.m4
+++ b/m4/ax_check_wx.m4
@@ -1,3 +1,4 @@
+#serial 1000
 dnl @synopsis AX_CHECK_WX(major, minor, release, action-if, action-if-not)
 dnl
 dnl @summary check for wxWidgets of sufficient major, minor and release version
diff --git a/m4/ax_check_zlib.m4 b/m4/ax_check_zlib.m4
index a3693f61..aae4e777 100644
--- a/m4/ax_check_zlib.m4
+++ b/m4/ax_check_zlib.m4
@@ -1,3 +1,4 @@
+#serial 1000
 dnl @synopsis AX_CHECK_ZLIB(major, minor, revision, subrevision, action-if, action-if-not)
 dnl
 dnl @summary check for ZLIB of sufficient major, minor, revision and subrevision version