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/usr/src/gcc-4.8/debian/patches/gdc-cross-install-location.diff is in gcc-4.8-source 4.8.5-4ubuntu2.

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--- a/src/libphobos/configure.ac
+++ b/src/libphobos/configure.ac
@@ -239,7 +239,7 @@
 fi
 
 if test "${gdc_host}" != "${gdc_target}"; then
-    gdc_include_dir='${libdir}/gcc/${host_alias}'/${d_gcc_ver}/include/d
+    gdc_include_dir='${libdir}/gcc-cross/${host_alias}'/${d_gcc_ver}/include/d
 else
     gdc_include_dir='${prefix}'/include/d/${d_gcc_ver}
 fi