--- ./configure.ac.orig	2019-10-11 12:40:29.000000000 +0200
+++ ./configure.ac	2019-10-11 12:40:50.000000000 +0200
@@ -21,7 +21,9 @@ AC_DISABLE_STATIC([])
 AC_PROG_CC
 AC_PROG_CXX
 AC_LANG([C++])
+AC_LANG_PUSH([C])
 AC_C_BIGENDIAN
+AC_LANG_POP([C])
 
 #AC_LIBTOOL_WIN32_DLL
 #AC_PROG_LIBTOOL