$OpenBSD: patch-m4_ax_prog_sphinx_version_m4,v 1.1 2021/02/20 22:27:30 sthen Exp $

Index: m4/ax_prog_sphinx_version.m4
--- m4/ax_prog_sphinx_version.m4.orig
+++ m4/ax_prog_sphinx_version.m4
@@ -40,7 +40,7 @@ AC_DEFUN([AX_PROG_SPHINX],[
 
         AC_MSG_CHECKING([for sphinx version])
         changequote(<<,>>)
-        sphinx_version=`$SPHINX_BUILD -h 2>&1 | $GREP "^Sphinx v" | $SED -e 's/^.* v\([0-9]*\.[0-9]*\.[0-9]*\)/\1/'`
+        sphinx_version=`$SPHINX_BUILD --version 2>&1 | $GREP "^sphinx" | $SED -e 's/^.* \([0-9]*\.[0-9]*\.[0-9]*\)/\1/'`
         changequote([,])
         AC_MSG_RESULT($sphinx_version)
 
