commit c7015694fa0d9401664663ad07a111b61e36985c
Author: Daniel Swanson <popcorn.tomato.dude@gmail.com>
Date:   Tue Aug 3 11:36:33 2021 -0500

    check for string_view.h in order to properly link against lttoolbox

diff --git a/configure.ac b/configure.ac
index a7f149a..bd5d64a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -21,6 +21,8 @@ PKG_CHECK_MODULES([ICU_IO], [icu-io])
 
 AC_CHECK_FUNCS([getopt_long])
 
+AC_CHECK_HEADERS([string_view])
+
 CPPFLAGS="$CPPFLAGS $CFLAGS $LTTOOLBOX_CFLAGS $ICU_CFLAGS $ICU_UC_CFLAGS $ICU_IO_CFLAGS"
 LIBS="$LIBS $LTTOOLBOX_LIBS $ICU_LIBS $ICU_UC_LIBS $ICU_IO_LIBS"