https://bugs.gentoo.org/803479

--- a/configure.ac
+++ b/configure.ac
@@ -1062,6 +1062,7 @@
 AC_PROG_INSTALL
 AC_PROG_INSTALL_DIRS
 AC_PROG_MAKE_SET
+AM_PROG_INSTALL_SH
 
 # By default, autoconf sets INSTALL_SCRIPT to '${INSTALL_PROGRAM}'.
 # That's wrong: it should be set to '${INSTALL}', so that one can