commit 66400c6fcff045f57056d59407c469ae51aa2648
Author: Daniel Swanson <popcorn.tomato.dude@gmail.com>
Date:   Tue Aug 3 15:53:42 2021 -0500

    pass along -DHAVE_STRING_VIEW to other repos

diff --git a/configure.ac b/configure.ac
index 96baab2..b46971f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -47,6 +47,11 @@ AC_CHECK_LIB(xml2, xmlReaderForFile)
 # Checks for header files.
 AC_HEADER_STDC
 AC_CHECK_HEADERS([stdlib.h string.h unistd.h stddef.h string_view])
+
+have_sv=""
+AC_CHECK_HEADERS([string_view], [have_sv="-DHAVE_STRING_VIEW"], [have_sv=""])
+AC_SUBST([have_sv])
+
 AC_CHECK_HEADER([utf8.h], [], [AC_MSG_ERROR([You don't have utfcpp installed.])])
 
 # Checks for typedefs, structures, and compiler characteristics.
diff --git a/lttoolbox.pc.in b/lttoolbox.pc.in
index 9ecf8f5..7b43523 100644
--- a/lttoolbox.pc.in
+++ b/lttoolbox.pc.in
@@ -7,4 +7,4 @@ Name: lttoolbox
 Description: Augmented letter transducer tools for natural language processing
 Version: @VERSION@
 Libs: -L${libdir} -llttoolbox@VERSION_MAJOR@
-Cflags: -I${includedir}/lttoolbox-@VERSION_API@
+Cflags: -I${includedir}/lttoolbox-@VERSION_API@ @have_sv@