Index: build-aux/m4/buildsys.m4
==================================================================
--- build-aux/m4/buildsys.m4
+++ build-aux/m4/buildsys.m4
@@ -33,10 +33,17 @@
 			AC_SUBST(BUILD_AND_HOST_ARE_DARWIN, yes)
 			;;
 		esac
 		;;
 	esac
+
+	AC_PROG_INSTALL
+	case "$INSTALL" in
+	./build-aux/install-sh*)
+		INSTALL="$PWD/$INSTALL"
+		;;
+	esac
 
 	AC_CONFIG_COMMANDS_PRE([
 		AS_IF([test x"$GCC" = x"yes"],
 			[AC_SUBST(DEP_CFLAGS, '-MD -MF $${out%.o}.dep')])
 		AS_IF([test x"$GXX" = x"yes"],