https://bugs.gentoo.org/720710
--- a/configure.ac
+++ b/configure.ac
@@ -22,6 +22,7 @@ AC_PROG_LN_S
 AC_PROG_CC
 AC_PROG_CXX
 AC_PROG_CPP
+AM_PROG_AR
 AM_PROG_CC_C_O
 AC_PROG_RANLIB
 AC_OBJEXT