diff --git a/pkgs/applications/graphics/ImageMagick/7.0.nix b/pkgs/applications/graphics/ImageMagick/7.0.nix
index ed1e580cb1670..1eb2e4320d6c7 100644
--- a/pkgs/applications/graphics/ImageMagick/7.0.nix
+++ b/pkgs/applications/graphics/ImageMagick/7.0.nix
@@ -18,13 +18,13 @@ in
 
 stdenv.mkDerivation rec {
   pname = "imagemagick";
-  version = "7.0.11-9";
+  version = "7.0.11-13";
 
   src = fetchFromGitHub {
     owner = "ImageMagick";
     repo = "ImageMagick";
     rev = version;
-    sha256 = "sha256-eL9zFrgkLb3pS8/UlQB5+p50UG8j3Q7TNDwcO/3BuXo=";
+    sha256 = "sha256-6dYc636m1OeRqIPv5NFz/K8OUvl6sgEQKjfvTngR2Ms=";
   };
 
   outputs = [ "out" "dev" "doc" ]; # bin/ isn't really big
diff --git a/pkgs/applications/version-management/git-and-tools/git/default.nix b/pkgs/applications/version-management/git-and-tools/git/default.nix
index 8ad150f13060a..53ac8a0d1a069 100644
--- a/pkgs/applications/version-management/git-and-tools/git/default.nix
+++ b/pkgs/applications/version-management/git-and-tools/git/default.nix
@@ -2,7 +2,7 @@
 , curl, openssl, zlib, expat, perlPackages, python3, gettext, cpio
 , gnugrep, gnused, gawk, coreutils # needed at runtime by git-filter-branch etc
 , openssh, pcre2
-, asciidoctor, texinfo, xmlto, docbook2x, docbook_xsl, docbook_xsl_ns, docbook_xml_dtd_45
+, asciidoc, texinfo, xmlto, docbook2x, docbook_xsl, docbook_xml_dtd_45
 , libxslt, tcl, tk, makeWrapper, libiconv
 , svnSupport, subversionClient, perlLibs, smtpPerlLibs
 , perlSupport ? stdenv.buildPlatform == stdenv.hostPlatform
@@ -68,8 +68,8 @@ stdenv.mkDerivation {
   '';
 
   nativeBuildInputs = [ gettext perlPackages.perl makeWrapper ]
-    ++ lib.optionals withManual [ asciidoctor texinfo xmlto docbook2x
-         docbook_xsl docbook_xsl_ns docbook_xml_dtd_45 libxslt ];
+    ++ lib.optionals withManual [ asciidoc texinfo xmlto docbook2x
+         docbook_xsl docbook_xml_dtd_45 libxslt ];
   buildInputs = [curl openssl zlib expat cpio libiconv]
     ++ lib.optionals perlSupport [ perlPackages.perl ]
     ++ lib.optionals guiSupport [tcl tk]
@@ -148,7 +148,7 @@ stdenv.mkDerivation {
       }
 
       # Install git-subtree.
-      make -C contrib/subtree install ${lib.optionalString withManual "USE_ASCIIDOCTOR=1 install-doc"}
+      make -C contrib/subtree install ${lib.optionalString withManual "install-doc"}
       rm -rf contrib/subtree
 
       # Install contrib stuff.
@@ -233,7 +233,7 @@ stdenv.mkDerivation {
       '')
 
    + lib.optionalString withManual ''# Install man pages
-       make -j $NIX_BUILD_CORES -l $NIX_BUILD_CORES USE_ASCIIDOCTOR=1 PERL_PATH="${buildPackages.perl}/bin/perl" cmd-list.made install install-html \
+       make -j $NIX_BUILD_CORES -l $NIX_BUILD_CORES PERL_PATH="${buildPackages.perl}/bin/perl" cmd-list.made install install-html \
          -C Documentation ''
 
    + (if guiSupport then ''
diff --git a/pkgs/build-support/pkg-config-wrapper/add-flags.sh b/pkgs/build-support/pkg-config-wrapper/add-flags.sh
index 35ecf62ca230f..90aee712be63d 100644
--- a/pkgs/build-support/pkg-config-wrapper/add-flags.sh
+++ b/pkgs/build-support/pkg-config-wrapper/add-flags.sh
@@ -6,7 +6,7 @@ var_templates_list=(
 accumulateRoles
 
 for var in "${var_templates_list[@]}"; do
-    mangleVarList "$var" ${role_suffixes[@]+"${role_suffixes[@]}"}
+    mangleVarListGeneric ":" "$var" ${role_suffixes[@]+"${role_suffixes[@]}"}
 done
 
 export NIX_PKG_CONFIG_WRAPPER_FLAGS_SET_@suffixSalt@=1
diff --git a/pkgs/build-support/wrapper-common/utils.bash b/pkgs/build-support/wrapper-common/utils.bash
index 66b7c3f3e83c5..f773270f7de94 100644
--- a/pkgs/build-support/wrapper-common/utils.bash
+++ b/pkgs/build-support/wrapper-common/utils.bash
@@ -13,7 +13,9 @@ accumulateRoles() {
     fi
 }
 
-mangleVarList() {
+mangleVarListGeneric() {
+    local sep="$1"
+    shift
     local var="$1"
     shift
     local -a role_suffixes=("$@")
@@ -25,11 +27,15 @@ mangleVarList() {
     for suffix in "${role_suffixes[@]}"; do
         local inputVar="${var}${suffix}"
         if [ -v "$inputVar" ]; then
-            export ${outputVar}+="${!outputVar:+ }${!inputVar}"
+            export ${outputVar}+="${!outputVar:+$sep}${!inputVar}"
         fi
     done
 }
 
+mangleVarList() {
+    mangleVarListGeneric " " "$@"
+}
+
 mangleVarBool() {
     local var="$1"
     shift
diff --git a/pkgs/development/compilers/llvm/10/clang/default.nix b/pkgs/development/compilers/llvm/10/clang/default.nix
index e0c52651cadc5..b42f40b969439 100644
--- a/pkgs/development/compilers/llvm/10/clang/default.nix
+++ b/pkgs/development/compilers/llvm/10/clang/default.nix
@@ -1,4 +1,4 @@
-{ lib, stdenv, llvm_meta, fetch, cmake, libxml2, libllvm, version, clang-tools-extra_src, python3
+{ lib, stdenv, llvm_meta, fetch, substituteAll, cmake, libxml2, libllvm, version, clang-tools-extra_src, python3
 , buildLlvmTools
 , fixDarwinDylibNames
 , enableManpages ? false
@@ -46,6 +46,10 @@ let
       # https://reviews.llvm.org/D51899
       ./compiler-rt-baremetal.patch
       ./gnu-install-dirs.patch
+      (substituteAll {
+        src = ../../clang-6-10-LLVMgold-path.patch;
+        libllvmLibdir = "${libllvm.lib}/lib";
+      })
     ];
 
     postPatch = ''
@@ -64,12 +68,7 @@ let
 
     outputs = [ "out" "lib" "dev" "python" ];
 
-    # Clang expects to find LLVMgold in its own prefix
     postInstall = ''
-      if [ -e ${libllvm.lib}/lib/LLVMgold.so ]; then
-        ln -sv ${libllvm.lib}/lib/LLVMgold.so $lib/lib
-      fi
-
       ln -sv $out/bin/clang $out/bin/cpp
 
       # Move libclang to 'lib' output
diff --git a/pkgs/development/compilers/llvm/11/clang/default.nix b/pkgs/development/compilers/llvm/11/clang/default.nix
index f23394a8b754b..07e5326128aa6 100644
--- a/pkgs/development/compilers/llvm/11/clang/default.nix
+++ b/pkgs/development/compilers/llvm/11/clang/default.nix
@@ -1,4 +1,4 @@
-{ lib, stdenv, llvm_meta, fetch, fetchpatch, cmake, libxml2, libllvm, version, clang-tools-extra_src, python3
+{ lib, stdenv, llvm_meta, fetch, fetchpatch, substituteAll, cmake, libxml2, libllvm, version, clang-tools-extra_src, python3
 , buildLlvmTools
 , fixDarwinDylibNames
 , enableManpages ? false
@@ -57,6 +57,10 @@ let
         excludes = [ "docs/*" "test/*" ];
         sha256 = "0gxgmi0qbm89mq911dahallhi8m6wa9vpklklqmxafx4rplrr8ph";
       })
+      (substituteAll {
+        src = ../../clang-11-12-LLVMgold-path.patch;
+        libllvmLibdir = "${libllvm.lib}/lib";
+      })
     ];
 
     postPatch = ''
@@ -75,12 +79,7 @@ let
 
     outputs = [ "out" "lib" "dev" "python" ];
 
-    # Clang expects to find LLVMgold in its own prefix
     postInstall = ''
-      if [ -e ${libllvm.lib}/lib/LLVMgold.so ]; then
-        ln -sv ${libllvm.lib}/lib/LLVMgold.so $lib/lib
-      fi
-
       ln -sv $out/bin/clang $out/bin/cpp
 
       # Move libclang to 'lib' output
diff --git a/pkgs/development/compilers/llvm/12/clang/default.nix b/pkgs/development/compilers/llvm/12/clang/default.nix
index 3d1106dbc52ca..dbd6ea1e1ac40 100644
--- a/pkgs/development/compilers/llvm/12/clang/default.nix
+++ b/pkgs/development/compilers/llvm/12/clang/default.nix
@@ -1,4 +1,4 @@
-{ lib, stdenv, llvm_meta, fetch, cmake, libxml2, libllvm, version, clang-tools-extra_src, python3
+{ lib, stdenv, llvm_meta, fetch, substituteAll, cmake, libxml2, libllvm, version, clang-tools-extra_src, python3
 , buildLlvmTools
 , fixDarwinDylibNames
 , enableManpages ? false
@@ -44,6 +44,10 @@ let
       ./purity.patch
       # https://reviews.llvm.org/D51899
       ./gnu-install-dirs.patch
+      (substituteAll {
+        src = ../../clang-11-12-LLVMgold-path.patch;
+        libllvmLibdir = "${libllvm.lib}/lib";
+      })
     ];
 
     postPatch = ''
@@ -59,12 +63,7 @@ let
 
     outputs = [ "out" "lib" "dev" "python" ];
 
-    # Clang expects to find LLVMgold in its own prefix
     postInstall = ''
-      if [ -e ${libllvm.lib}/lib/LLVMgold.so ]; then
-        ln -sv ${libllvm.lib}/lib/LLVMgold.so $lib/lib
-      fi
-
       ln -sv $out/bin/clang $out/bin/cpp
 
       # Move libclang to 'lib' output
diff --git a/pkgs/development/compilers/llvm/5/clang/LLVMgold-path.patch b/pkgs/development/compilers/llvm/5/clang/LLVMgold-path.patch
new file mode 100644
index 0000000000000..6a09c91b5132b
--- /dev/null
+++ b/pkgs/development/compilers/llvm/5/clang/LLVMgold-path.patch
@@ -0,0 +1,14 @@
+diff --git a/lib/Driver/ToolChains/CommonArgs.cpp b/lib/Driver/ToolChains/CommonArgs.cpp
+index 00bd60bc24bb..17416b0bd3c0 100644
+--- a/lib/Driver/ToolChains/CommonArgs.cpp
++++ b/lib/Driver/ToolChains/CommonArgs.cpp
+@@ -376,8 +376,7 @@ void tools::AddGoldPlugin(const ToolChain &ToolChain, const ArgList &Args,
+   // as gold requires -plugin to come before any -plugin-opt that -Wl might
+   // forward.
+   CmdArgs.push_back("-plugin");
+-  std::string Plugin =
+-      ToolChain.getDriver().Dir + "/../lib" CLANG_LIBDIR_SUFFIX "/LLVMgold.so";
++  std::string Plugin = "@libllvmLibdir@" "/LLVMgold.so";
+   CmdArgs.push_back(Args.MakeArgString(Plugin));
+ 
+   // Try to pass driver level flags relevant to LTO code generation down to
diff --git a/pkgs/development/compilers/llvm/5/clang/default.nix b/pkgs/development/compilers/llvm/5/clang/default.nix
index b5887a23c65ec..df3d261398669 100644
--- a/pkgs/development/compilers/llvm/5/clang/default.nix
+++ b/pkgs/development/compilers/llvm/5/clang/default.nix
@@ -1,4 +1,4 @@
-{ lib, stdenv, llvm_meta, fetch, cmake, libxml2, libllvm, version, clang-tools-extra_src, python3
+{ lib, stdenv, llvm_meta, fetch, substituteAll, cmake, libxml2, libllvm, version, clang-tools-extra_src, python3
 , buildLlvmTools
 , fixDarwinDylibNames
 , enableManpages ? false
@@ -43,6 +43,10 @@ let
     patches = [
       ./purity.patch
       ./gnu-install-dirs.patch
+      (substituteAll {
+        src = ./LLVMgold-path.patch;
+        libllvmLibdir = "${libllvm.lib}/lib";
+      })
     ];
 
     postPatch = ''
@@ -58,12 +62,7 @@ let
 
     outputs = [ "out" "lib" "dev" "python" ];
 
-    # Clang expects to find LLVMgold in its own prefix
     postInstall = ''
-      if [ -e ${libllvm.lib}/lib/LLVMgold.so ]; then
-        ln -sv ${libllvm.lib}/lib/LLVMgold.so $lib/lib
-      fi
-
       ln -sv $out/bin/clang $out/bin/cpp
 
       # Move libclang to 'lib' output
diff --git a/pkgs/development/compilers/llvm/6/clang/default.nix b/pkgs/development/compilers/llvm/6/clang/default.nix
index eba9111d9d323..ee8859c159a1b 100644
--- a/pkgs/development/compilers/llvm/6/clang/default.nix
+++ b/pkgs/development/compilers/llvm/6/clang/default.nix
@@ -1,4 +1,4 @@
-{ lib, stdenv, llvm_meta, fetch, cmake, libxml2, libllvm, version, clang-tools-extra_src, python3
+{ lib, stdenv, llvm_meta, fetch, substituteAll, cmake, libxml2, libllvm, version, clang-tools-extra_src, python3
 , buildLlvmTools
 , fixDarwinDylibNames
 , enableManpages ? false
@@ -43,6 +43,10 @@ let
     patches = [
       ./purity.patch
       ./gnu-install-dirs.patch
+      (substituteAll {
+        src = ../../clang-6-10-LLVMgold-path.patch;
+        libllvmLibdir = "${libllvm.lib}/lib";
+      })
     ];
 
     postPatch = ''
@@ -58,12 +62,7 @@ let
 
     outputs = [ "out" "lib" "dev" "python" ];
 
-    # Clang expects to find LLVMgold in its own prefix
     postInstall = ''
-      if [ -e ${libllvm.lib}/lib/LLVMgold.so ]; then
-        ln -sv ${libllvm.lib}/lib/LLVMgold.so $lib/lib
-      fi
-
       ln -sv $out/bin/clang $out/bin/cpp
 
       # Move libclang to 'lib' output
diff --git a/pkgs/development/compilers/llvm/7/clang/default.nix b/pkgs/development/compilers/llvm/7/clang/default.nix
index e1b031ad352b1..afa1669ace618 100644
--- a/pkgs/development/compilers/llvm/7/clang/default.nix
+++ b/pkgs/development/compilers/llvm/7/clang/default.nix
@@ -1,4 +1,4 @@
-{ lib, stdenv, llvm_meta, fetch, cmake, libxml2, libllvm, version, clang-tools-extra_src, python3
+{ lib, stdenv, llvm_meta, fetch, substituteAll, cmake, libxml2, libllvm, version, clang-tools-extra_src, python3
 , buildLlvmTools
 , fixDarwinDylibNames
 , enableManpages ? false
@@ -52,6 +52,10 @@ let
       # needed for our bootstrapping to not interfere with C.
       ./unwindlib.patch
       ./gnu-install-dirs.patch
+      (substituteAll {
+        src = ../../clang-6-10-LLVMgold-path.patch;
+        libllvmLibdir = "${libllvm.lib}/lib";
+      })
     ];
 
     postPatch = ''
@@ -70,12 +74,7 @@ let
 
     outputs = [ "out" "lib" "dev" "python" ];
 
-    # Clang expects to find LLVMgold in its own prefix
     postInstall = ''
-      if [ -e ${libllvm.lib}/lib/LLVMgold.so ]; then
-        ln -sv ${libllvm.lib}/lib/LLVMgold.so $lib/lib
-      fi
-
       ln -sv $out/bin/clang $out/bin/cpp
 
       # Move libclang to 'lib' output
diff --git a/pkgs/development/compilers/llvm/8/clang/default.nix b/pkgs/development/compilers/llvm/8/clang/default.nix
index c3399dccd1d77..5cb7720d026f2 100644
--- a/pkgs/development/compilers/llvm/8/clang/default.nix
+++ b/pkgs/development/compilers/llvm/8/clang/default.nix
@@ -1,4 +1,4 @@
-{ lib, stdenv, llvm_meta, fetch, cmake, libxml2, libllvm, version, clang-tools-extra_src, python3
+{ lib, stdenv, llvm_meta, fetch, substituteAll, cmake, libxml2, libllvm, version, clang-tools-extra_src, python3
 , buildLlvmTools
 , fixDarwinDylibNames
 , enableManpages ? false
@@ -59,6 +59,10 @@ let
       # make clang -xhip use $PATH to find executables
       ./HIP-use-PATH-8.patch
       ./gnu-install-dirs.patch
+      (substituteAll {
+        src = ../../clang-6-10-LLVMgold-path.patch;
+        libllvmLibdir = "${libllvm.lib}/lib";
+      })
     ];
 
     postPatch = ''
@@ -77,12 +81,7 @@ let
 
     outputs = [ "out" "lib" "dev" "python" ];
 
-    # Clang expects to find LLVMgold in its own prefix
     postInstall = ''
-      if [ -e ${libllvm.lib}/lib/LLVMgold.so ]; then
-        ln -sv ${libllvm.lib}/lib/LLVMgold.so $lib/lib
-      fi
-
       ln -sv $out/bin/clang $out/bin/cpp
 
       # Move libclang to 'lib' output
diff --git a/pkgs/development/compilers/llvm/9/clang/default.nix b/pkgs/development/compilers/llvm/9/clang/default.nix
index 700fcb414fceb..c98b4a830c422 100644
--- a/pkgs/development/compilers/llvm/9/clang/default.nix
+++ b/pkgs/development/compilers/llvm/9/clang/default.nix
@@ -1,4 +1,4 @@
-{ lib, stdenv, llvm_meta, fetch, cmake, libxml2, libllvm, version, clang-tools-extra_src, python3
+{ lib, stdenv, llvm_meta, fetch, substituteAll, cmake, libxml2, libllvm, version, clang-tools-extra_src, python3
 , buildLlvmTools
 , fixDarwinDylibNames
 , enableManpages ? false
@@ -52,6 +52,10 @@ let
       # make clang -xhip use $PATH to find executables
       ./HIP-use-PATH-9.patch
       ./gnu-install-dirs.patch
+      (substituteAll {
+        src = ../../clang-6-10-LLVMgold-path.patch;
+        libllvmLibdir = "${libllvm.lib}/lib";
+      })
     ];
 
     postPatch = ''
@@ -70,12 +74,7 @@ let
 
     outputs = [ "out" "lib" "dev" "python" ];
 
-    # Clang expects to find LLVMgold in its own prefix
     postInstall = ''
-      if [ -e ${libllvm.lib}/lib/LLVMgold.so ]; then
-        ln -sv ${libllvm.lib}/lib/LLVMgold.so $lib/lib
-      fi
-
       ln -sv $out/bin/clang $out/bin/cpp
 
       # Move libclang to 'lib' output
diff --git a/pkgs/development/compilers/llvm/clang-11-12-LLVMgold-path.patch b/pkgs/development/compilers/llvm/clang-11-12-LLVMgold-path.patch
new file mode 100644
index 0000000000000..8f8991976f33c
--- /dev/null
+++ b/pkgs/development/compilers/llvm/clang-11-12-LLVMgold-path.patch
@@ -0,0 +1,13 @@
+diff --git a/lib/Driver/ToolChains/CommonArgs.cpp b/lib/Driver/ToolChains/CommonArgs.cpp
+index 6b6e276b8ce7..7896542a1202 100644
+--- a/lib/Driver/ToolChains/CommonArgs.cpp
++++ b/lib/Driver/ToolChains/CommonArgs.cpp
+@@ -409,7 +409,7 @@ void tools::addLTOOptions(const ToolChain &ToolChain, const ArgList &Args,
+ 
+     SmallString<1024> Plugin;
+     llvm::sys::path::native(
+-        Twine(D.Dir) + "/../lib" CLANG_LIBDIR_SUFFIX "/LLVMgold" + Suffix,
++        Twine("@libllvmLibdir@" "/LLVMgold") + Suffix,
+         Plugin);
+     CmdArgs.push_back(Args.MakeArgString(Plugin));
+   }
diff --git a/pkgs/development/compilers/llvm/clang-6-10-LLVMgold-path.patch b/pkgs/development/compilers/llvm/clang-6-10-LLVMgold-path.patch
new file mode 100644
index 0000000000000..93504316edf30
--- /dev/null
+++ b/pkgs/development/compilers/llvm/clang-6-10-LLVMgold-path.patch
@@ -0,0 +1,15 @@
+diff --git a/lib/Driver/ToolChains/CommonArgs.cpp b/lib/Driver/ToolChains/CommonArgs.cpp
+index 37ec73468570..b73e75aa6e59 100644
+--- a/lib/Driver/ToolChains/CommonArgs.cpp
++++ b/lib/Driver/ToolChains/CommonArgs.cpp
+@@ -370,8 +370,8 @@ void tools::AddGoldPlugin(const ToolChain &ToolChain, const ArgList &Args,
+ #endif
+ 
+   SmallString<1024> Plugin;
+-  llvm::sys::path::native(Twine(ToolChain.getDriver().Dir) +
+-                              "/../lib" CLANG_LIBDIR_SUFFIX "/LLVMgold" +
++  llvm::sys::path::native(Twine("@libllvmLibdir@"
++                                "/LLVMgold") +
+                               Suffix,
+                           Plugin);
+   CmdArgs.push_back(Args.MakeArgString(Plugin));
diff --git a/pkgs/development/compilers/rust/1_52.nix b/pkgs/development/compilers/rust/1_52.nix
index 775792d06f602..822708741bda9 100644
--- a/pkgs/development/compilers/rust/1_52.nix
+++ b/pkgs/development/compilers/rust/1_52.nix
@@ -15,21 +15,22 @@
 , CoreFoundation, Security
 , pkgsBuildTarget, pkgsBuildBuild, pkgsBuildHost
 , makeRustPlatform
-, llvmPackages_11, llvm_11
+, llvmPackages_11
+, llvmPackages_12, llvm_12
 } @ args:
 
 import ./default.nix {
   rustcVersion = "1.52.1";
   rustcSha256 = "sha256-Om8jom0Oj4erv78yxc19qgwLcdCYar78Vrml+/vQv5g=";
 
-  llvmSharedForBuild = pkgsBuildBuild.llvmPackages_11.libllvm.override { enableSharedLibraries = true; };
-  llvmSharedForHost = pkgsBuildHost.llvmPackages_11.libllvm.override { enableSharedLibraries = true; };
-  llvmSharedForTarget = pkgsBuildTarget.llvmPackages_11.libllvm.override { enableSharedLibraries = true; };
+  llvmSharedForBuild = pkgsBuildBuild.llvmPackages_12.libllvm.override { enableSharedLibraries = true; };
+  llvmSharedForHost = pkgsBuildHost.llvmPackages_12.libllvm.override { enableSharedLibraries = true; };
+  llvmSharedForTarget = pkgsBuildTarget.llvmPackages_12.libllvm.override { enableSharedLibraries = true; };
 
   llvmBootstrapForDarwin = llvmPackages_11;
 
   # For use at runtime
-  llvmShared = llvm_11.override { enableSharedLibraries = true; };
+  llvmShared = llvm_12.override { enableSharedLibraries = true; };
 
   # Note: the version MUST be one version prior to the version we're
   # building
@@ -55,4 +56,4 @@ import ./default.nix {
   ];
 }
 
-(builtins.removeAttrs args [ "fetchpatch" "pkgsBuildHost" "llvmPackages_11" "llvm_11"])
+(builtins.removeAttrs args [ "fetchpatch" "pkgsBuildHost" "llvmPackages_11" "llvmPackages_12" "llvm_12"])
diff --git a/pkgs/development/libraries/libndctl/default.nix b/pkgs/development/libraries/libndctl/default.nix
index 91a2c378c03c3..6e82191e75587 100644
--- a/pkgs/development/libraries/libndctl/default.nix
+++ b/pkgs/development/libraries/libndctl/default.nix
@@ -1,5 +1,5 @@
 { lib, stdenv, fetchFromGitHub, autoreconfHook
-, asciidoctor, pkg-config, xmlto, docbook_xsl, docbook_xml_dtd_45, libxslt
+, asciidoc, pkg-config, xmlto, docbook_xsl, docbook_xml_dtd_45, libxslt
 , json_c, kmod, which, util-linux, udev, keyutils
 }:
 
@@ -17,7 +17,7 @@ stdenv.mkDerivation rec {
   outputs = [ "out" "lib" "man" "dev" ];
 
   nativeBuildInputs =
-    [ autoreconfHook asciidoctor pkg-config xmlto docbook_xml_dtd_45 docbook_xsl libxslt
+    [ autoreconfHook asciidoc pkg-config xmlto docbook_xml_dtd_45 docbook_xsl libxslt
       which
     ];
 
@@ -28,6 +28,7 @@ stdenv.mkDerivation rec {
   configureFlags =
     [ "--without-bash"
       "--without-systemd"
+      "--disable-asciidoctor" # depends on ruby 2.7, use asciidoc instead
     ];
 
   patchPhase = ''
diff --git a/pkgs/development/libraries/libxml2/default.nix b/pkgs/development/libraries/libxml2/default.nix
index ca3cbc4a18840..1b58b4539e465 100644
--- a/pkgs/development/libraries/libxml2/default.nix
+++ b/pkgs/development/libraries/libxml2/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, lib, fetchurl
+{ stdenv, lib, fetchurl, fetchpatch
 , zlib, xz, libintl, python, gettext, ncurses, findXMLCatalogs
 , pythonSupport ? enableShared && stdenv.buildPlatform == stdenv.hostPlatform
 , icuSupport ? false, icu ? null
@@ -27,6 +27,13 @@ stdenv.mkDerivation rec {
     #   https://github.com/NixOS/nixpkgs/pull/63174
     #   https://github.com/NixOS/nixpkgs/pull/72342
     ./utf8-xmlErrorFuncHandler.patch
+
+    # Work around lxml API misuse.
+    # https://gitlab.gnome.org/GNOME/libxml2/issues/255
+    (fetchpatch {
+      url = "https://gitlab.gnome.org/GNOME/libxml2/commit/85b1792e37b131e7a51af98a37f92472e8de5f3f.patch";
+      sha256 = "epqlNs2S0Zczox3KyCB6R2aJKh87lXydlZ0x6tLHweE=";
+    })
   ];
 
   outputs = [ "bin" "dev" "out" "man" "doc" ]
diff --git a/pkgs/development/python-modules/pywemo/default.nix b/pkgs/development/python-modules/pywemo/default.nix
index 7448f1f7f2c7f..ceb190fe753ae 100644
--- a/pkgs/development/python-modules/pywemo/default.nix
+++ b/pkgs/development/python-modules/pywemo/default.nix
@@ -47,11 +47,6 @@ buildPythonPackage rec {
     pytestCheckHook
   ];
 
-  disabledTests = [
-    # https://github.com/NixOS/nixpkgs/issues/124165
-    "test_bridge_getdevicestatus"
-  ];
-
   pythonImportsCheck = [ "pywemo" ];
 
   meta = with lib; {
diff --git a/pkgs/tools/filesystems/curlftpfs/default.nix b/pkgs/tools/filesystems/curlftpfs/default.nix
index 2c5d886c14df7..8c8fe31624fe7 100644
--- a/pkgs/tools/filesystems/curlftpfs/default.nix
+++ b/pkgs/tools/filesystems/curlftpfs/default.nix
@@ -1,11 +1,21 @@
 { lib, stdenv, fetchurl, autoreconfHook, fuse, curl, pkg-config, glib, zlib }:
 
-stdenv.mkDerivation {
-  name = "curlftpfs-0.9.2";
+stdenv.mkDerivation rec {
+  pname = "curlftpfs";
+  version = "0.9.2";
+
   src = fetchurl {
-    url = "mirror://sourceforge/curlftpfs/curlftpfs-0.9.2.tar.gz";
+    url = "mirror://sourceforge/curlftpfs/curlftpfs-${version}.tar.gz";
     sha256 = "0n397hmv21jsr1j7zx3m21i7ryscdhkdsyqpvvns12q7qwwlgd2f";
   };
+
+  patches = [
+    # This removes AC_FUNC_MALLOC and AC_FUNC_REALLOC from configure.ac because
+    # it is known to cause problems. Search online for "rpl_malloc" and
+    # "rpl_realloc" to find out more.
+    ./fix-rpl_malloc.patch
+  ];
+
   nativeBuildInputs = [ autoreconfHook pkg-config ];
   buildInputs = [ fuse curl glib zlib ];
 
@@ -24,7 +34,7 @@ stdenv.mkDerivation {
   meta = with lib; {
     description = "Filesystem for accessing FTP hosts based on FUSE and libcurl";
     homepage = "http://curlftpfs.sourceforge.net";
-    license = licenses.gpl2;
+    license = licenses.gpl2Only;
     platforms = platforms.unix;
   };
 }
diff --git a/pkgs/tools/filesystems/curlftpfs/fix-rpl_malloc.patch b/pkgs/tools/filesystems/curlftpfs/fix-rpl_malloc.patch
new file mode 100644
index 0000000000000..0265e1d828937
--- /dev/null
+++ b/pkgs/tools/filesystems/curlftpfs/fix-rpl_malloc.patch
@@ -0,0 +1,13 @@
+diff -Naur a/configure.ac b/configure.ac
+--- a/configure.ac	2008-04-23 20:37:42.000000000 +0900
++++ b/configure.ac	2021-05-16 01:28:24.000000000 +0900
+@@ -46,9 +46,7 @@
+ 
+ # Checks for library functions.
+ AC_FUNC_CHOWN
+-AC_FUNC_MALLOC
+ AC_FUNC_MKTIME
+-AC_FUNC_REALLOC
+ AC_FUNC_SELECT_ARGTYPES
+ AC_FUNC_STRFTIME
+ AC_FUNC_UTIME_NULL
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 7aa9dd3776adc..e563a29cb2ee8 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -11606,7 +11606,7 @@ in
   };
   rust_1_52 = callPackage ../development/compilers/rust/1_52.nix {
     inherit (darwin.apple_sdk.frameworks) CoreFoundation Security;
-    llvm_11 = llvmPackages_11.libllvm;
+    llvm_12 = llvmPackages_12.libllvm;
   };
   rust = rust_1_52;