commit 96a673a4b0b7da004b7ffe6460894e94f57cd14a
Author: Samuel Thibault <samuel.thibault@ens-lyon.org>
Date:   Tue Aug 24 19:17:48 2021 +0200

    configure: Allow libtirpc to be missing
    
    The dependency on libtirpc is already optional in the Makefiles, we do
    not need to fail configure when it is missing.
    
    * configure.ac: Do not fail when libtirpc is not available.

diff --git a/configure.ac b/configure.ac
index 63ba7c1d..9f131e9a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -317,7 +317,7 @@ AC_DEFINE_UNQUOTED([X11_PREFIX], "$X11_PREFIX")
 AC_SUBST([X11_KEYSYMDEF_H])
 
 # Check for Sun RPC headers and library.
-PKG_CHECK_MODULES([libtirpc], [libtirpc], [HAVE_SUN_RPC=yes])
+PKG_CHECK_MODULES([libtirpc], [libtirpc], [HAVE_SUN_RPC=yes], [HAVE_SUN_RPC=no])
 AC_SUBST([HAVE_SUN_RPC])
 AC_SUBST([libtirpc_CFLAGS])
 AC_SUBST([libtirpc_LIBS])
