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/usr/src/gcc-6/debian/patches/gdc-base-version.diff is in gcc-6-source 6.4.0-17ubuntu1.

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# DP: Use the GCC base version for the D include dir name

Index: b/src/libphobos/m4/druntime.m4
===================================================================
--- a/src/libphobos/m4/druntime.m4
+++ b/src/libphobos/m4/druntime.m4
@@ -43,7 +43,7 @@ AC_DEFUN([DRUNTIME_INSTALL_DIRECTORIES],
   AC_REQUIRE([AC_PROG_GDC])
 
   AC_MSG_CHECKING([D GCC version])
-  d_gcc_ver=`$GDC -dumpversion`
+  d_gcc_ver=`$GDC -dumpversion | sed 's/^\(@<:@0-9@:>@*\).*/\1/'`
   AC_MSG_RESULT($d_gcc_ver)
   AC_ARG_WITH([cross-host],
     AC_HELP_STRING([--with-cross-host=HOST],
Index: b/src/libphobos/configure.ac
===================================================================
--- a/src/libphobos/configure.ac
+++ b/src/libphobos/configure.ac
@@ -53,6 +53,7 @@ m4_rename([_AC_ARG_VAR_PRECIOUS],[glibd_
 m4_define([_AC_ARG_VAR_PRECIOUS],[])
 AM_PROG_AS
 AC_PROG_CC
+dnl dummy change to run autoreconf in this directory
 AC_PROG_GDC
 WITH_LOCAL_DRUNTIME([GDC_CHECK_COMPILE], [])