Fix for older autotools that don't define "abs_top_YYY" by default

diff --git a/configure.ac b/configure.ac
index c1b0014..5f835b1 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -10,6 +10,9 @@ AC_PREFIX_DEFAULT(/usr/local)
 
 COMPILER_FLAGS
 
+AC_SUBST(abs_top_srcdir)
+AC_SUBST(abs_top_builddir)
+
 AC_LANG_C
 
 AC_PROG_CC