diff --git a/lib/download.rb b/lib/download.rb
index 5b824f5..913fd86 100644
--- a/lib/download.rb
+++ b/lib/download.rb
@@ -43,11 +43,11 @@ module SlackBuilder
     checksum
   end
 
-  def hosted_sources(absolute_url)
+  def self.hosted_sources(absolute_url)
     CONFIG[:download_url] + absolute_url
   end
 
-  def remote_file_exists?(url)
+  def self.remote_file_exists?(url)
     uri = URI hosted_sources(url)
 
     request = Net::HTTP.new uri.host, uri.port
@@ -60,7 +60,7 @@ module SlackBuilder
   def self.download_and_deploy(uri, tarball)
     remote_path = tarball[tarball.index('/')..]
 
-    if SlackBuilder.remote_file_exists?(remote_path)
+    if remote_file_exists?(remote_path)
       uri = URI hosted_sources(remote_path)
       return download(uri, "slackbuilds/#{tarball}").hexdigest
     end
diff --git a/private/gcc-latest/gcc-latest.SlackBuild b/private/gcc-latest/gcc-latest.SlackBuild
index 3f67a91..eaa5fa8 100755
--- a/private/gcc-latest/gcc-latest.SlackBuild
+++ b/private/gcc-latest/gcc-latest.SlackBuild
@@ -30,7 +30,7 @@ cd $(dirname $0) ; CWD=$(pwd)
 
 PRGNAM=gcc-latest
 VERSION=${VERSION:-12.2.0}
-BUILD=${BUILD:-1}
+BUILD=${BUILD:-2}
 TAG=${TAG:-_SBo}
 PKGTYPE=${PKGTYPE:-tgz}
 
@@ -108,6 +108,7 @@ find -L . \
 
 # Smite the fixincludes:
 patch -p1 --verbose -i $CWD/patches/gcc-no_fixincludes.diff
+patch -p1 --verbose -i $CWD/patches/gdc-immutable-struct.patch
 
 mkdir ../objdir
 cd ../objdir
@@ -124,7 +125,7 @@ fi
   --mandir=/usr/man \
   --infodir=/usr/info \
   --enable-shared \
-  --disable-bootstrap \
+  --enable-bootstrap \
   --enable-languages=c,c++,d \
   --enable-threads=posix \
   --enable-checking=release \
@@ -141,11 +142,14 @@ fi
   --disable-install-libiberty \
   --disable-werror \
   --with-gcc-major-version-only \
+  --with-gnu-ld \
   --with-isl \
   --program-suffix=-12 \
+  --enable-version-specific-runtime-libs \
   --with-arch-directory=$LIB_ARCH \
   --disable-gtktest \
   --enable-clocale=gnu \
+  --enable-libphobos \
   $GCC_ARCHOPTS \
   --target=${TARGET} \
   --build=${TARGET} \
@@ -156,13 +160,12 @@ make install-strip DESTDIR=$PKG
 
 rm $PKG/usr/lib${LIBDIRSUFFIX}/*.la
 
-mkdir -p $PKG/usr/lib${LIBDIRSUFFIX}/gcc-12
 mkdir -p $PKG/usr/share/gdb/auto-load/usr/lib$LIBDIRSUFFIX
 
-mv $PKG/usr/lib$LIBDIRSUFFIX/*-gdb.py \
+mv $PKG/usr/lib$LIBDIRSUFFIX/gcc/$TARGET/12/*-gdb.py \
   $PKG/usr/share/gdb/auto-load/usr/lib$LIBDIRSUFFIX/
-mv $PKG/usr/lib${LIBDIRSUFFIX}/*.{a,o,spec,so*} \
-  $PKG/usr/lib${LIBDIRSUFFIX}/gcc-12
+mv $PKG/usr/lib${LIBDIRSUFFIX}/*.so* \
+  $PKG/usr/lib$LIBDIRSUFFIX/gcc/$TARGET/12/
 
 cd ../gcc-$VERSION
 
diff --git a/private/gcc-latest/patches/gdc-immutable-struct.patch b/private/gcc-latest/patches/gdc-immutable-struct.patch
new file mode 100644
index 0000000..5c47aa7
--- /dev/null
+++ b/private/gcc-latest/patches/gdc-immutable-struct.patch
@@ -0,0 +1,91 @@
+From 2583365912c8700abe1f4a23ed611acb80fac09d Mon Sep 17 00:00:00 2001
+From: Iain Buclaw <ibuclaw@gdcproject.org>
+Date: Mon, 27 Feb 2023 20:46:18 +0100
+Subject: [PATCH] d: Fix ICE on explicit immutable struct import [PR108877]
+
+Const and immutable types are built as variants of the type they are
+derived from, and TYPE_STUB_DECL is not set for these variants.
+
+	PR d/108877
+
+gcc/d/ChangeLog:
+
+	* imports.cc (ImportVisitor::visit (EnumDeclaration *)): Call
+	make_import on TYPE_MAIN_VARIANT.
+	(ImportVisitor::visit (AggregateDeclaration *)): Likewise.
+	(ImportVisitor::visit (ClassDeclaration *)): Likewise.
+
+gcc/testsuite/ChangeLog:
+
+	* gdc.dg/imports/pr108877a.d: New test.
+	* gdc.dg/pr108877.d: New test.
+
+(cherry picked from commit ce1cea3e22f58bbddde017f8a92e59bae8892339)
+---
+ gcc/d/imports.cc                         | 7 ++++++-
+ gcc/testsuite/gdc.dg/imports/pr108877a.d | 6 ++++++
+ gcc/testsuite/gdc.dg/pr108877.d          | 9 +++++++++
+ 3 files changed, 21 insertions(+), 1 deletion(-)
+ create mode 100644 gcc/testsuite/gdc.dg/imports/pr108877a.d
+ create mode 100644 gcc/testsuite/gdc.dg/pr108877.d
+
+diff --git a/gcc/d/imports.cc b/gcc/d/imports.cc
+index dfda2401ee8..6a59ef61b9c 100644
+--- a/gcc/d/imports.cc
++++ b/gcc/d/imports.cc
+@@ -106,12 +106,16 @@ public:
+     tree type = build_ctype (d->type);
+     /* Not all kinds of D enums create a TYPE_DECL.  */
+     if (TREE_CODE (type) == ENUMERAL_TYPE)
+-      this->result_ = this->make_import (TYPE_STUB_DECL (type));
++      {
++	type = TYPE_MAIN_VARIANT (type);
++	this->result_ = this->make_import (TYPE_STUB_DECL (type));
++      }
+   }
+ 
+   void visit (AggregateDeclaration *d)
+   {
+     tree type = build_ctype (d->type);
++    type = TYPE_MAIN_VARIANT (type);
+     this->result_ = this->make_import (TYPE_STUB_DECL (type));
+   }
+ 
+@@ -119,6 +123,7 @@ public:
+   {
+     /* Want the RECORD_TYPE, not POINTER_TYPE.  */
+     tree type = TREE_TYPE (build_ctype (d->type));
++    type = TYPE_MAIN_VARIANT (type);
+     this->result_ = this->make_import (TYPE_STUB_DECL (type));
+   }
+ 
+diff --git a/gcc/testsuite/gdc.dg/imports/pr108877a.d b/gcc/testsuite/gdc.dg/imports/pr108877a.d
+new file mode 100644
+index 00000000000..a23c78ddf84
+--- /dev/null
++++ b/gcc/testsuite/gdc.dg/imports/pr108877a.d
+@@ -0,0 +1,6 @@
++immutable struct ImmutableS { }
++const struct ConstS { }
++immutable class ImmutableC { }
++const class ConstC { }
++immutable enum ImmutableE { _ }
++const enum ConstE { _ }
+diff --git a/gcc/testsuite/gdc.dg/pr108877.d b/gcc/testsuite/gdc.dg/pr108877.d
+new file mode 100644
+index 00000000000..710551f3f9a
+--- /dev/null
++++ b/gcc/testsuite/gdc.dg/pr108877.d
+@@ -0,0 +1,9 @@
++// { dg-options "-I $srcdir/gdc.dg" }
++// { dg-do compile }
++import imports.pr108877a :
++    ImmutableS,
++    ConstS,
++    ImmutableC,
++    ConstC,
++    ImmutableE,
++    ConstE;
+-- 
+2.31.1
+
diff --git a/test.sh b/test.sh
index 7d35d75..c436583 100755
--- a/test.sh
+++ b/test.sh
@@ -1,3 +1,4 @@
 #!/bin/sh
 
 bundle install
+bundle exec rubocop