--- a/libquadmath/configure.ac	Thu Oct 25 07:37:49 2018 +0900
+++ b/libquadmath/configure.ac	Thu Feb 13 11:34:05 2020 +0900
@@ -1,7 +1,6 @@
 # Process this file with autoconf to produce a configure script, like so:
 # aclocal && autoconf && autoheader && automake
 
-AC_PREREQ(2.64)
 AC_INIT([GCC Quad-precision Math Library], 0.1,,[libquadmath])
 AC_CONFIG_HEADER(config.h)
 
@@ -83,6 +82,8 @@
 fi
 AC_PROG_CPP
 
+GCC_WITH_TOOLEXECLIBDIR
+
 # Calculate toolexeclibdir
 # Also toolexecdir, though it's only used in toolexeclibdir
 case ${version_specific_libs} in
@@ -98,7 +99,14 @@
        test x"$with_cross_host" != x"no"; then
       # Install a library built with a cross compiler in tooldir, not libdir.
       toolexecdir='$(exec_prefix)/$(target_alias)'
-      toolexeclibdir='$(toolexecdir)/lib'
+      case ${with_toolexeclibdir} in
+	no)
+	  toolexeclibdir='$(toolexecdir)/lib'
+	  ;;
+	*)
+	  toolexeclibdir=${with_toolexeclibdir}
+	  ;;
+      esac
     else
       toolexecdir='$(libdir)/gcc-lib/$(target_alias)'
       toolexeclibdir='$(libdir)'