commit 31e4a18e28e1da74a841090accb675dba87af4d8
Author: Daniel Swanson <popcorn.tomato.dude@gmail.com>
Date:   Tue Jun 8 18:49:01 2021 -0500

    drop pcre as a dependency

diff --git a/configure.ac b/configure.ac
index 1cc4491..7965f13 100644
--- a/configure.ac
+++ b/configure.ac
@@ -69,27 +69,8 @@ fi
 
 AC_CHECK_FUNCS(strcasecmp)
 
-if test x$(uname) != xDarwin;
-then
-AC_CHECK_HEADER(pcreposix.h,
-  AC_CHECK_LIB(pcre, pcre_fullinfo,[
-    LIBS="$LIBS -lpcreposix -lpcre"
-    no_comp_check=yes],
-    AC_MSG_ERROR([*** unable to locate pcre library ***])),
-  AC_MSG_ERROR([*** unable to locate pcreposix.h include file ***]))
-
-AC_CHECK_HEADER(pcrecpp.h,
-  AC_CHECK_LIB(pcrecpp,pcre_compile,[
-  LIBS="$LIBS -lpcrecpp"
-  no_comp_check=yes],
-  AC_MSG_ERROR([*** unable to locate pcrecpp library ***])),
-  AC_MSG_ERROR([*** unable to locate pcrecpp.h include file ***]))
-fi
-
-
 PKG_CHECK_MODULES(LTTOOLBOX, [lttoolbox >= 3.5.3], CPPFLAGS="$CPPFLAGS $LTTOOLBOX_CFLAGS"; LIBS="$LIBS $LTTOOLBOX_LIBS")
 PKG_CHECK_MODULES(LIBXML2, [libxml-2.0 >= 2.6.17], CPPFLAGS="$CPPFLAGS $LIBXML2_CFLAGS"; LIBS="$LIBS $LIBXML2_LIBS")
-PKG_CHECK_MODULES(PCRE, [libpcre >= 6.4], CPPFLAGS="$CPPFLAGS $PCRE_CFLAGS"; LIBS="$LIBS $PCRE_LIBS")
 PKG_CHECK_MODULES(ICU, [icu-i18n, icu-io, icu-uc], CPPFLAGS="$CPPFLAGS $ICU_CFLAGS"; LIBS="$LIBS $ICU_LIBS")
 
 AC_C_BIGENDIAN
diff --git a/m4/ax_check_icu.m4 b/m4/ax_check_icu.m4
deleted file mode 100644
index 0137afd..0000000
--- a/m4/ax_check_icu.m4
+++ /dev/null
@@ -1,117 +0,0 @@
-# ===========================================================================
-#       https://www.gnu.org/software/autoconf-archive/ax_check_icu.html
-# ===========================================================================
-#
-# SYNOPSIS
-#
-#   AX_CHECK_ICU(version, action-if, action-if-not)
-#
-# DESCRIPTION
-#
-#   Defines ICU_LIBS, ICU_CFLAGS, ICU_CXXFLAGS. See icu-config(1) man page.
-#
-# LICENSE
-#
-#   Copyright (c) 2008 Akos Maroy <darkeye@tyrell.hu>
-#
-#   Copying and distribution of this file, with or without modification, are
-#   permitted in any medium without royalty provided the copyright notice
-#   and this notice are preserved. This file is offered as-is, without any
-#   warranty.
-
-#serial 7
-
-AU_ALIAS([AC_CHECK_ICU], [AX_CHECK_ICU])
-AC_DEFUN([AX_CHECK_ICU], [
-  succeeded=no
-
-  if test -z "$ICU_CONFIG"; then
-    AC_PATH_PROG(ICU_CONFIG, icu-config, no)
-  fi
-
-  if test -z "$PKG_CONFIG"; then
-    AC_PATH_PROG(PKG_CONFIG, pkg-config, no)
-  fi
-
-  if test "$ICU_CONFIG" = "no" && test "$PKG_CONFIG" = "no" ; then
-    echo "*** Neither icu-config nor pkg-config could not be found. Make sure either is"
-    echo "*** in your path, and that taglib is properly installed."
-    echo "*** Or see https://ibm.com/software/globalization/icu/"
-  fi
-
-  if test "$ICU_CONFIG" != "no" ; then
-    ICU_VERSION=`$ICU_CONFIG --version`
-    AC_MSG_CHECKING(for ICU >= $1 via icu-config)
-        VERSION_CHECK=`expr $ICU_VERSION \>\= $1`
-        if test "$VERSION_CHECK" = "1" ; then
-            AC_MSG_RESULT(yes)
-            succeeded=yes
-
-            AC_MSG_CHECKING(ICU_CPPFLAGS)
-            ICU_CPPFLAGS=`$ICU_CONFIG --cppflags`
-            AC_MSG_RESULT($ICU_CPPFLAGS)
-
-            AC_MSG_CHECKING(ICU_CFLAGS)
-            ICU_CFLAGS=`$ICU_CONFIG --cflags`
-            AC_MSG_RESULT($ICU_CFLAGS)
-
-            AC_MSG_CHECKING(ICU_CXXFLAGS)
-            ICU_CXXFLAGS=`$ICU_CONFIG --cxxflags`
-            AC_MSG_RESULT($ICU_CXXFLAGS)
-
-            AC_MSG_CHECKING(ICU_LIBS)
-            ICU_LIBS=`$ICU_CONFIG --ldflags`
-            AC_MSG_RESULT($ICU_LIBS)
-        else
-            ICU_CPPFLAGS=""
-            ICU_CFLAGS=""
-            ICU_CXXFLAGS=""
-            ICU_LIBS=""
-            ## If we have a custom action on failure, don't print errors, but
-            ## do set a variable so people can do so.
-            ifelse([$3], ,echo "can't find ICU >= $1 via icu-config",)
-        fi
-  fi
-
-  if test "$succeeded" != "yes" && test "$PKG_CONFIG" != "no" ; then
-    AC_MSG_CHECKING(for ICU >= $1 via pkg-config)
-        if $PKG_CONFIG --atleast-version=$1 icu-i18n ; then
-            AC_MSG_RESULT(yes)
-            succeeded=yes
-
-            AC_MSG_CHECKING(ICU_CPPFLAGS)
-            ICU_CPPFLAGS=`$PKG_CONFIG --variable=CPPFLAGS icu-i18n`
-            AC_MSG_RESULT($ICU_CPPFLAGS)
-
-            AC_MSG_CHECKING(ICU_CFLAGS)
-            ICU_CFLAGS=`$PKG_CONFIG --variable=CFLAGS icu-i18n`
-            AC_MSG_RESULT($ICU_CFLAGS)
-
-            AC_MSG_CHECKING(ICU_CXXFLAGS)
-            ICU_CXXFLAGS=`$PKG_CONFIG --variable=CXXFLAGS icu-i18n`
-            AC_MSG_RESULT($ICU_CXXFLAGS)
-
-            AC_MSG_CHECKING(ICU_LIBS)
-            ICU_LIBS=`$PKG_CONFIG --libs icu-i18n`
-            AC_MSG_RESULT($ICU_LIBS)
-        else
-            ICU_CPPFLAGS=""
-            ICU_CFLAGS=""
-            ICU_CXXFLAGS=""
-            ICU_LIBS=""
-            ## If we have a custom action on failure, don't print errors, but
-            ## do set a variable so people can do so.
-            ifelse([$3], ,echo "can't find ICU >= $1 via pkg-config",)
-        fi
-  fi
-
-  if test "$succeeded" = "yes"; then
-     AC_SUBST(ICU_CPPFLAGS)
-     AC_SUBST(ICU_CFLAGS)
-     AC_SUBST(ICU_CXXFLAGS)
-     AC_SUBST(ICU_LIBS)
-     ifelse([$2], , :, [$2])
-  else
-     ifelse([$3], , AC_MSG_ERROR([Library requirements (ICU) not met.]), [$3])
-  fi
-])