diff -Naur a/gcc/d/d-incpath.cc b/gcc/d/d-incpath.cc
--- a/gcc/d/d-incpath.cc	2019-01-01 13:31:55.000000000 +0100
+++ b/gcc/d/d-incpath.cc	2019-06-28 08:32:00.326241502 +0200
@@ -140,7 +140,7 @@
 	    path = xstrdup (p->fname);
 
 	  /* Add D-specific suffix.  */
-	  path = concat (path, "/d", NULL);
+	  path = concat (path, "/dlang/gdc", NULL);
 
 	  /* Ignore duplicate entries.  */
 	  bool found = false;
diff -Naur a/libphobos/configure b/libphobos/configure
--- a/libphobos/configure	2019-05-03 10:01:59.000000000 +0200
+++ b/libphobos/configure	2019-06-28 08:33:13.286912269 +0200
@@ -15294,7 +15294,7 @@
 
 
   # Default case for install directory for D sources files.
-  gdc_include_dir='$(libdir)/gcc/${target_alias}/${gcc_version}/include/d'
+  gdc_include_dir='/usr/include/dlang/gdc/'
 
 
 
diff -Naur a/libphobos/m4/druntime.m4 b/libphobos/m4/druntime.m4
--- a/libphobos/m4/druntime.m4	2018-11-02 09:29:50.000000000 +0100
+++ b/libphobos/m4/druntime.m4	2019-06-28 08:33:59.551891885 +0200
@@ -104,7 +104,7 @@
   AC_SUBST(libphobos_toolexeclibdir)
 
   # Default case for install directory for D sources files.
-  gdc_include_dir='$(libdir)/gcc/${target_alias}/${gcc_version}/include/d'
+  gdc_include_dir='/usr/include/dlang/gdc/'
   AC_SUBST(gdc_include_dir)
 ])