diff --git a/pkgs/development/libraries/glibc/2.27.nix b/pkgs/development/libraries/glibc/2.27.nix
deleted file mode 100644
index bb057ae899e..00000000000
--- a/pkgs/development/libraries/glibc/2.27.nix
+++ /dev/null
@@ -1,101 +0,0 @@
-{ stdenv, callPackage
-, withLinuxHeaders ? true
-, installLocales ? true
-, profilingLibraries ? false
-, withGd ? false
-}:
-
-assert stdenv.cc.isGNU;
-
-callPackage ./common-2.27.nix { inherit stdenv; } {
-    name = "glibc" + stdenv.lib.optionalString withGd "-gd";
-
-    inherit withLinuxHeaders profilingLibraries installLocales withGd;
-
-    NIX_NO_SELF_RPATH = true;
-
-    postConfigure = ''
-      # Hack: get rid of the `-static' flag set by the bootstrap stdenv.
-      # This has to be done *after* `configure' because it builds some
-      # test binaries.
-      export NIX_CFLAGS_LINK=
-      export NIX_LDFLAGS_BEFORE=
-
-      export NIX_DONT_SET_RPATH=1
-      unset CFLAGS
-
-      # Apparently --bindir is not respected.
-      makeFlagsArray+=("bindir=$bin/bin" "sbindir=$bin/sbin" "rootsbindir=$bin/sbin")
-    '';
-
-    # The stackprotector and fortify hardening flags are autodetected by glibc
-    # and enabled by default if supported. Setting it for every gcc invocation
-    # does not work.
-    hardeningDisable = [ "stackprotector" "fortify" ];
-
-    # When building glibc from bootstrap-tools, we need libgcc_s at RPATH for
-    # any program we run, because the gcc will have been placed at a new
-    # store path than that determined when built (as a source for the
-    # bootstrap-tools tarball)
-    # Building from a proper gcc staying in the path where it was installed,
-    # libgcc_s will not be at {gcc}/lib, and gcc's libgcc will be found without
-    # any special hack.
-    preInstall = ''
-      if [ -f ${stdenv.cc.cc}/lib/libgcc_s.so.1 ]; then
-          mkdir -p $out/lib
-          cp ${stdenv.cc.cc}/lib/libgcc_s.so.1 $out/lib/libgcc_s.so.1
-          # the .so It used to be a symlink, but now it is a script
-          cp -a ${stdenv.cc.cc}/lib/libgcc_s.so $out/lib/libgcc_s.so
-      fi
-    '';
-
-    postInstall = ''
-      if test -n "$installLocales"; then
-          make -j''${NIX_BUILD_CORES:-1} -l''${NIX_BUILD_CORES:-1} localedata/install-locales
-      fi
-
-      test -f $out/etc/ld.so.cache && rm $out/etc/ld.so.cache
-
-      if test -n "$linuxHeaders"; then
-          # Include the Linux kernel headers in Glibc, except the `scsi'
-          # subdirectory, which Glibc provides itself.
-          (cd $dev/include && \
-           ln -sv $(ls -d $linuxHeaders/include/* | grep -v scsi\$) .)
-      fi
-
-      # Fix for NIXOS-54 (ldd not working on x86_64).  Make a symlink
-      # "lib64" to "lib".
-      if test -n "$is64bit"; then
-          ln -s lib $out/lib64
-      fi
-
-      # Get rid of more unnecessary stuff.
-      rm -rf $out/var $bin/bin/sln
-
-      # For some reason these aren't stripped otherwise and retain reference
-      # to bootstrap-tools; on cross-arm this stripping would break objects.
-      if [ -z "$crossConfig" ]; then
-        for i in "$out"/lib/*.a; do
-            [ "$i" = "$out/lib/libm.a" ] || strip -S "$i"
-        done
-      fi
-
-      # Put libraries for static linking in a separate output.  Note
-      # that libc_nonshared.a and libpthread_nonshared.a are required
-      # for dynamically-linked applications.
-      mkdir -p $static/lib
-      mv $out/lib/*.a $static/lib
-      mv $static/lib/lib*_nonshared.a $out/lib
-      # Some of *.a files are linker scripts where moving broke the paths.
-      sed "/^GROUP/s|$out/lib/lib|$static/lib/lib|g" \
-        -i "$static"/lib/*.a
-
-      # Work around a Nix bug: hard links across outputs cause a build failure.
-      cp $bin/bin/getconf $bin/bin/getconf_
-      mv $bin/bin/getconf_ $bin/bin/getconf
-    '';
-
-    separateDebugInfo = true;
-
-    meta.description = "The GNU C Library";
-  }
diff --git a/pkgs/development/libraries/glibc/common-2.27.nix b/pkgs/development/libraries/glibc/common-2.27.nix
deleted file mode 100644
index 4a5b31245c1..00000000000
--- a/pkgs/development/libraries/glibc/common-2.27.nix
+++ /dev/null
@@ -1,216 +0,0 @@
-/* Build configuration used to build glibc, Info files, and locale
-   information.  */
-
-{ stdenv, lib
-, buildPlatform, hostPlatform
-, buildPackages
-, fetchurl, fetchpatch ? null
-, linuxHeaders ? null
-, gd ? null, libpng ? null
-, bison
-}:
-
-{ name
-, withLinuxHeaders ? false
-, profilingLibraries ? false
-, installLocales ? false
-, withGd ? false
-, meta
-, ...
-} @ args:
-
-let
-  version = "2.27";
-  patchSuffix = "";
-  sha256 = "0wpwq7gsm7sd6ysidv0z575ckqdg13cr2njyfgrbgh4f65adwwji";
-  cross = if buildPlatform != hostPlatform then hostPlatform else null;
-in
-
-assert withLinuxHeaders -> linuxHeaders != null;
-assert withGd -> gd != null && libpng != null;
-
-stdenv.mkDerivation ({
-  inherit  installLocales;
-  linuxHeaders = if withLinuxHeaders then linuxHeaders else null;
-
-  # The host/target system.
-  crossConfig = if cross != null then cross.config else null;
-
-  inherit (stdenv) is64bit;
-
-  enableParallelBuilding = true;
-
-  patches =
-    [
-      /* Have rpcgen(1) look for cpp(1) in $PATH.  */
-      ./rpcgen-path.patch
-
-      /* Allow NixOS and Nix to handle the locale-archive. */
-      ./nix-locale-archive-2.27.patch
-
-      /* Don't use /etc/ld.so.cache, for non-NixOS systems.  */
-      ./dont-use-system-ld-so-cache-2.27.patch
-
-      /* Don't use /etc/ld.so.preload, but /etc/ld-nix.so.preload.  */
-      ./dont-use-system-ld-so-preload.patch
-
-      /* The command "getconf CS_PATH" returns the default search path
-         "/bin:/usr/bin", which is inappropriate on NixOS machines. This
-         patch extends the search path by "/run/current-system/sw/bin". */
-      ./fix_path_attribute_in_getconf.patch
-
-      /* Allow running with RHEL 6 -like kernels.  The patch adds an exception
-        for glibc to accept 2.6.32 and to tag the ELFs as 2.6.32-compatible
-        (otherwise the loader would refuse libc).
-        Note that glibc will fully work only on their heavily patched kernels
-        and we lose early mismatch detection on 2.6.32.
-
-        On major glibc updates we should check that the patched kernel supports
-        all the required features.  ATM it's verified up to glibc-2.26-131.
-        # HOWTO: check glibc sources for changes in kernel requirements
-        git log -p glibc-2.25.. sysdeps/unix/sysv/linux/x86_64/kernel-features.h sysdeps/unix/sysv/linux/kernel-features.h
-        # get kernel sources (update the URL)
-        mkdir tmp && cd tmp
-        curl http://vault.centos.org/6.9/os/Source/SPackages/kernel-2.6.32-696.el6.src.rpm | rpm2cpio - | cpio -idmv
-        tar xf linux-*.bz2
-        # check syscall presence, for example
-        less linux-*?/arch/x86/kernel/syscall_table_32.S
-       */
-      ./allow-kernel-2.6.32.patch
-    ]
-    ++ lib.optional stdenv.isx86_64 ./fix-x64-abi.patch
-    ++ lib.optional stdenv.hostPlatform.isMusl
-      (fetchpatch {
-        name = "fix-with-musl.patch";
-        url = "https://sourceware.org/bugzilla/attachment.cgi?id=10151&action=diff&collapsed=&headers=1&format=raw";
-        sha256 = "18kk534k6da5bkbsy1ivbi77iin76lsna168mfcbwv4ik5vpziq2";
-      });
-
-  postPatch =
-    ''
-      # Needed for glibc to build with the gnumake 3.82
-      # http://comments.gmane.org/gmane.linux.lfs.support/31227
-      sed -i 's/ot \$/ot:\n\ttouch $@\n$/' manual/Makefile
-
-      # nscd needs libgcc, and we don't want it dynamically linked
-      # because we don't want it to depend on bootstrap-tools libs.
-      echo "LDFLAGS-nscd += -static-libgcc" >> nscd/Makefile
-    '';
-
-  configureFlags =
-    [ "-C"
-      "--enable-add-ons"
-      "--enable-obsolete-nsl"
-      "--enable-obsolete-rpc"
-      "--sysconfdir=/etc"
-      "--enable-stackguard-randomization"
-      (if withLinuxHeaders
-       then "--with-headers=${linuxHeaders}/include"
-       else "--without-headers")
-      (if profilingLibraries
-       then "--enable-profile"
-       else "--disable-profile")
-    ] ++ lib.optionals withLinuxHeaders [
-      "--enable-kernel=3.2.0" # can't get below with glibc >= 2.26
-    ] ++ lib.optionals (cross != null) [
-      (if cross ? float && cross.float == "soft" then "--without-fp" else "--with-fp")
-    ] ++ lib.optionals (cross != null) [
-      "--with-__thread"
-    ] ++ lib.optionals (cross == null && stdenv.isArm) [
-      "--host=arm-linux-gnueabi"
-      "--build=arm-linux-gnueabi"
-
-      # To avoid linking with -lgcc_s (dynamic link)
-      # so the glibc does not depend on its compiler store path
-      "libc_cv_as_needed=no"
-    ] ++ lib.optional withGd "--with-gd";
-
-  installFlags = [ "sysconfdir=$(out)/etc" ];
-
-  outputs = [ "out" "bin" "dev" "static" ];
-
-  depsBuildBuild = [ buildPackages.stdenv.cc ];
-  nativeBuildInputs = [ bison ];
-  buildInputs = lib.optionals withGd [ gd libpng ];
-
-  # Needed to install share/zoneinfo/zone.tab.  Set to impure /bin/sh to
-  # prevent a retained dependency on the bootstrap tools in the stdenv-linux
-  # bootstrap.
-  BASH_SHELL = "/bin/sh";
-}
-
-// (removeAttrs args [ "withLinuxHeaders" "withGd" ]) //
-
-{
-  name = name + "-${version}${patchSuffix}";
-
-  src = fetchurl {
-    url = "mirror://gnu/glibc/glibc-${version}.tar.xz";
-    inherit sha256;
-  };
-
-  # Remove absolute paths from `configure' & co.; build out-of-tree.
-  preConfigure = ''
-    export PWD_P=$(type -tP pwd)
-    for i in configure io/ftwtest-sh; do
-        # Can't use substituteInPlace here because replace hasn't been
-        # built yet in the bootstrap.
-        sed -i "$i" -e "s^/bin/pwd^$PWD_P^g"
-    done
-
-    mkdir ../build
-    cd ../build
-
-    configureScript="`pwd`/../$sourceRoot/configure"
-
-    ${lib.optionalString (stdenv.cc.libc != null)
-      ''makeFlags="$makeFlags BUILD_LDFLAGS=-Wl,-rpath,${stdenv.cc.libc}/lib"''
-    }
-
-
-  '' + lib.optionalString (cross != null) ''
-    sed -i s/-lgcc_eh//g "../$sourceRoot/Makeconfig"
-
-    cat > config.cache << "EOF"
-    libc_cv_forced_unwind=yes
-    libc_cv_c_cleanup=yes
-    libc_cv_gnu89_inline=yes
-    EOF
-  '';
-
-  preBuild = lib.optionalString withGd "unset NIX_DONT_SET_RPATH";
-
-  meta = {
-    homepage = http://www.gnu.org/software/libc/;
-    description = "The GNU C Library";
-
-    longDescription =
-      '' Any Unix-like operating system needs a C library: the library which
-         defines the "system calls" and other basic facilities such as
-         open, malloc, printf, exit...
-
-         The GNU C library is used as the C library in the GNU system and
-         most systems with the Linux kernel.
-      '';
-
-    license = lib.licenses.lgpl2Plus;
-
-    maintainers = [ lib.maintainers.eelco ];
-    platforms = lib.platforms.linux;
-  } // meta;
-
-  passthru = { inherit version; };
-}
-
-// lib.optionalAttrs (cross != null) {
-  preInstall = null; # clobber the native hook
-
-  dontStrip = true;
-
-  separateDebugInfo = false; # this is currently broken for crossDrv
-
-  # To avoid a dependency on the build system 'bash'.
-  preFixup = ''
-    rm -f $bin/bin/{ldd,tzselect,catchsegv,xtrace}
-  '';
-})
diff --git a/pkgs/development/libraries/glibc/common.nix b/pkgs/development/libraries/glibc/common.nix
index c8e5b456285..517c98e9f64 100644
--- a/pkgs/development/libraries/glibc/common.nix
+++ b/pkgs/development/libraries/glibc/common.nix
@@ -7,6 +7,7 @@
 , fetchurl, fetchpatch ? null
 , linuxHeaders ? null
 , gd ? null, libpng ? null
+, bison
 }:
 
 { name
@@ -19,9 +20,9 @@
 } @ args:
 
 let
-  version = "2.26";
-  patchSuffix = "-131";
-  sha256 = "1ggnj1hzjym7sn93rbwydcqd562q73lsb7g7kd199g6j9j9hlkp5";
+  version = "2.27";
+  patchSuffix = "";
+  sha256 = "0wpwq7gsm7sd6ysidv0z575ckqdg13cr2njyfgrbgh4f65adwwji";
   cross = if buildPlatform != hostPlatform then hostPlatform else null;
 in
 
@@ -29,7 +30,7 @@ assert withLinuxHeaders -> linuxHeaders != null;
 assert withGd -> gd != null && libpng != null;
 
 stdenv.mkDerivation ({
-  inherit  installLocales;
+  inherit version installLocales;
   linuxHeaders = if withLinuxHeaders then linuxHeaders else null;
 
   # The host/target system.
@@ -41,17 +42,6 @@ stdenv.mkDerivation ({
 
   patches =
     [
-      /*  No tarballs for stable upstream branch, only https://sourceware.org/git/?p=glibc.git
-          $ git co release/2.25/master; git describe
-          glibc-2.25-49-gbc5ace67fe
-          $ git show --reverse glibc-2.25..release/2.25/master | gzip -n -9 --rsyncable - > 2.25-49.patch.gz
-      */
-      ./2.26-75.patch.gz
-      ./2.26-75to115.diff.gz
-      # contains fix for CVE-2018-1000001 as the last commit:
-      # https://sourceware.org/git/?p=glibc.git;a=commit;h=fabef2edbc
-      ./2.26-115to131.diff.gz
-
       /* Have rpcgen(1) look for cpp(1) in $PATH.  */
       ./rpcgen-path.patch
 
@@ -97,24 +87,14 @@ stdenv.mkDerivation ({
       });
 
   postPatch =
-    # Needed for glibc to build with the gnumake 3.82
-    # http://comments.gmane.org/gmane.linux.lfs.support/31227
     ''
+      # Needed for glibc to build with the gnumake 3.82
+      # http://comments.gmane.org/gmane.linux.lfs.support/31227
       sed -i 's/ot \$/ot:\n\ttouch $@\n$/' manual/Makefile
-    ''
-    # nscd needs libgcc, and we don't want it dynamically linked
-    # because we don't want it to depend on bootstrap-tools libs.
-    + ''
+
+      # nscd needs libgcc, and we don't want it dynamically linked
+      # because we don't want it to depend on bootstrap-tools libs.
       echo "LDFLAGS-nscd += -static-libgcc" >> nscd/Makefile
-    ''
-    # Replace the date and time in nscd by a prefix of $out.
-    # It is used as a protocol compatibility check.
-    # Note: the size of the struct changes, but using only a part
-    # would break hash-rewriting. When receiving stats it does check
-    # that the struct sizes match and can't cause overflow or something.
-    + ''
-      cat ${./glibc-remove-datetime-from-nscd.patch} \
-        | sed "s,@out@,$out," | patch -p1
     '';
 
   configureFlags =
@@ -150,6 +130,7 @@ stdenv.mkDerivation ({
   outputs = [ "out" "bin" "dev" "static" ];
 
   depsBuildBuild = [ buildPackages.stdenv.cc ];
+  nativeBuildInputs = [ bison ];
   buildInputs = lib.optionals withGd [ gd libpng ];
 
   # Needed to install share/zoneinfo/zone.tab.  Set to impure /bin/sh to
diff --git a/pkgs/development/libraries/glibc/dont-use-system-ld-so-cache-2.27.patch b/pkgs/development/libraries/glibc/dont-use-system-ld-so-cache-2.27.patch
deleted file mode 100644
index f84b1049adf..00000000000
--- a/pkgs/development/libraries/glibc/dont-use-system-ld-so-cache-2.27.patch
+++ /dev/null
@@ -1,46 +0,0 @@
-diff -Naur glibc-2.27-orig/elf/ldconfig.c glibc-2.27/elf/ldconfig.c
---- glibc-2.27-orig/elf/ldconfig.c	2018-02-01 11:17:18.000000000 -0500
-+++ glibc-2.27/elf/ldconfig.c	2018-02-17 22:43:17.232175182 -0500
-@@ -51,7 +51,7 @@
- #endif
- 
- #ifndef LD_SO_CONF
--# define LD_SO_CONF SYSCONFDIR "/ld.so.conf"
-+# define LD_SO_CONF PREFIX "/etc/ld.so.conf"
- #endif
- 
- /* Get libc version number.  */
-diff -Naur glibc-2.27-orig/elf/Makefile glibc-2.27/elf/Makefile
---- glibc-2.27-orig/elf/Makefile	2018-02-01 11:17:18.000000000 -0500
-+++ glibc-2.27/elf/Makefile	2018-02-17 22:44:50.334006750 -0500
-@@ -559,13 +559,13 @@
- 
- $(objpfx)ldconfig: $(ldconfig-modules:%=$(objpfx)%.o)
- 
--SYSCONF-FLAGS := -D'SYSCONFDIR="$(sysconfdir)"'
--CFLAGS-ldconfig.c += $(SYSCONF-FLAGS) -D'LIBDIR="$(libdir)"' \
-+PREFIX-FLAGS := -D'PREFIX="$(prefix)"'
-+CFLAGS-ldconfig.c += $(PREFIX-FLAGS) -D'LIBDIR="$(libdir)"' \
- 		    -D'SLIBDIR="$(slibdir)"'
- libof-ldconfig = ldconfig
--CFLAGS-dl-cache.c += $(SYSCONF-FLAGS)
--CFLAGS-cache.c += $(SYSCONF-FLAGS)
--CFLAGS-rtld.c += $(SYSCONF-FLAGS)
-+CFLAGS-dl-cache.c += $(PREFIX-FLAGS)
-+CFLAGS-cache.c += $(PREFIX-FLAGS)
-+CFLAGS-rtld.c += $(PREFIX-FLAGS)
- 
- cpp-srcs-left := $(all-rtld-routines:=.os)
- lib := rtld
-diff -Naur glibc-2.27-orig/sysdeps/generic/dl-cache.h glibc-2.27/sysdeps/generic/dl-cache.h
---- glibc-2.27-orig/sysdeps/generic/dl-cache.h	2018-02-01 11:17:18.000000000 -0500
-+++ glibc-2.27/sysdeps/generic/dl-cache.h	2018-02-17 22:45:20.471598816 -0500
-@@ -28,7 +28,7 @@
- #endif
- 
- #ifndef LD_SO_CACHE
--# define LD_SO_CACHE SYSCONFDIR "/ld.so.cache"
-+# define LD_SO_CACHE PREFIX "/etc/ld.so.cache"
- #endif
- 
- #ifndef add_system_dir
diff --git a/pkgs/development/libraries/glibc/dont-use-system-ld-so-cache.patch b/pkgs/development/libraries/glibc/dont-use-system-ld-so-cache.patch
index fc14553c3ee..f84b1049adf 100644
--- a/pkgs/development/libraries/glibc/dont-use-system-ld-so-cache.patch
+++ b/pkgs/development/libraries/glibc/dont-use-system-ld-so-cache.patch
@@ -1,7 +1,7 @@
-diff -ru glibc-2.16.0-orig/elf/ldconfig.c glibc-2.16.0/elf/ldconfig.c
---- glibc-2.16.0-orig/elf/ldconfig.c	2012-06-30 15:12:34.000000000 -0400
-+++ glibc-2.16.0/elf/ldconfig.c	2012-09-18 11:59:27.463284814 -0400
-@@ -50,7 +50,7 @@
+diff -Naur glibc-2.27-orig/elf/ldconfig.c glibc-2.27/elf/ldconfig.c
+--- glibc-2.27-orig/elf/ldconfig.c	2018-02-01 11:17:18.000000000 -0500
++++ glibc-2.27/elf/ldconfig.c	2018-02-17 22:43:17.232175182 -0500
+@@ -51,7 +51,7 @@
  #endif
  
  #ifndef LD_SO_CONF
@@ -10,31 +10,31 @@ diff -ru glibc-2.16.0-orig/elf/ldconfig.c glibc-2.16.0/elf/ldconfig.c
  #endif
  
  /* Get libc version number.  */
-diff -ru glibc-2.16.0-orig/elf/Makefile glibc-2.16.0/elf/Makefile
---- glibc-2.16.0-orig/elf/Makefile	2012-06-30 15:12:34.000000000 -0400
-+++ glibc-2.16.0/elf/Makefile	2012-09-18 12:03:30.031955196 -0400
-@@ -415,12 +415,12 @@
+diff -Naur glibc-2.27-orig/elf/Makefile glibc-2.27/elf/Makefile
+--- glibc-2.27-orig/elf/Makefile	2018-02-01 11:17:18.000000000 -0500
++++ glibc-2.27/elf/Makefile	2018-02-17 22:44:50.334006750 -0500
+@@ -559,13 +559,13 @@
  
  $(objpfx)ldconfig: $(ldconfig-modules:%=$(objpfx)%.o)
  
 -SYSCONF-FLAGS := -D'SYSCONFDIR="$(sysconfdir)"'
--CFLAGS-ldconfig.c = $(SYSCONF-FLAGS) -D'LIBDIR="$(libdir)"' \
+-CFLAGS-ldconfig.c += $(SYSCONF-FLAGS) -D'LIBDIR="$(libdir)"' \
 +PREFIX-FLAGS := -D'PREFIX="$(prefix)"'
-+CFLAGS-ldconfig.c = $(PREFIX-FLAGS) -D'LIBDIR="$(libdir)"' \
++CFLAGS-ldconfig.c += $(PREFIX-FLAGS) -D'LIBDIR="$(libdir)"' \
  		    -D'SLIBDIR="$(slibdir)"'
  libof-ldconfig = ldconfig
--CFLAGS-dl-cache.c = $(SYSCONF-FLAGS)
--CFLAGS-cache.c = $(SYSCONF-FLAGS)
--CFLAGS-rtld.c = $(SYSCONF-FLAGS)
-+CFLAGS-dl-cache.c = $(PREFIX-FLAGS)
-+CFLAGS-cache.c = $(PREFIX-FLAGS)
-+CFLAGS-rtld.c = $(PREFIX-FLAGS)
+-CFLAGS-dl-cache.c += $(SYSCONF-FLAGS)
+-CFLAGS-cache.c += $(SYSCONF-FLAGS)
+-CFLAGS-rtld.c += $(SYSCONF-FLAGS)
++CFLAGS-dl-cache.c += $(PREFIX-FLAGS)
++CFLAGS-cache.c += $(PREFIX-FLAGS)
++CFLAGS-rtld.c += $(PREFIX-FLAGS)
  
  cpp-srcs-left := $(all-rtld-routines:=.os)
  lib := rtld
-diff -ru glibc-2.16.0-orig/sysdeps/generic/dl-cache.h glibc-2.16.0/sysdeps/generic/dl-cache.h
---- glibc-2.16.0-orig/sysdeps/generic/dl-cache.h	2012-06-30 15:12:34.000000000 -0400
-+++ glibc-2.16.0/sysdeps/generic/dl-cache.h	2012-09-18 11:59:27.465284809 -0400
+diff -Naur glibc-2.27-orig/sysdeps/generic/dl-cache.h glibc-2.27/sysdeps/generic/dl-cache.h
+--- glibc-2.27-orig/sysdeps/generic/dl-cache.h	2018-02-01 11:17:18.000000000 -0500
++++ glibc-2.27/sysdeps/generic/dl-cache.h	2018-02-17 22:45:20.471598816 -0500
 @@ -28,7 +28,7 @@
  #endif
  
diff --git a/pkgs/development/libraries/glibc/nix-locale-archive-2.27.patch b/pkgs/development/libraries/glibc/nix-locale-archive-2.27.patch
deleted file mode 100644
index 39312951fcf..00000000000
--- a/pkgs/development/libraries/glibc/nix-locale-archive-2.27.patch
+++ /dev/null
@@ -1,118 +0,0 @@
-diff -Naur glibc-2.27-orig/locale/loadarchive.c glibc-2.27/locale/loadarchive.c
---- glibc-2.27-orig/locale/loadarchive.c	2018-02-01 11:17:18.000000000 -0500
-+++ glibc-2.27/locale/loadarchive.c	2018-02-17 22:32:25.680169462 -0500
-@@ -123,6 +123,23 @@
-   return MAX (namehash_end, MAX (string_end, locrectab_end));
- }
- 
-+static int
-+open_locale_archive (void)
-+{
-+  int fd = -1;
-+  char *versioned_path = getenv ("LOCALE_ARCHIVE_2_27");
-+  char *path = getenv ("LOCALE_ARCHIVE");
-+  if (versioned_path)
-+    fd = __open_nocancel (versioned_path, O_RDONLY|O_LARGEFILE|O_CLOEXEC);
-+  if (path && fd < 0)
-+    fd = __open_nocancel (path, O_RDONLY|O_LARGEFILE|O_CLOEXEC);
-+  if (fd < 0)
-+    fd = __open_nocancel (archfname, O_RDONLY|O_LARGEFILE|O_CLOEXEC);
-+  if (fd < 0)
-+    fd = __open_nocancel ("/usr/lib/locale/locale-archive", O_RDONLY|O_LARGEFILE|O_CLOEXEC);
-+  return fd;
-+}
-+
- 
- /* Find the locale *NAMEP in the locale archive, and return the
-    internalized data structure for its CATEGORY data.  If this locale has
-@@ -202,7 +219,7 @@
-       archmapped = &headmap;
- 
-       /* The archive has never been opened.  */
--      fd = __open_nocancel (archfname, O_RDONLY|O_LARGEFILE|O_CLOEXEC);
-+      fd = open_locale_archive ();
-       if (fd < 0)
- 	/* Cannot open the archive, for whatever reason.  */
- 	return NULL;
-@@ -397,8 +414,7 @@
- 	  if (fd == -1)
- 	    {
- 	      struct stat64 st;
--	      fd = __open_nocancel (archfname,
--				    O_RDONLY|O_LARGEFILE|O_CLOEXEC);
-+	      fd = open_locale_archive ();
- 	      if (fd == -1)
- 		/* Cannot open the archive, for whatever reason.  */
- 		return NULL;
-diff -Naur glibc-2.27-orig/locale/programs/locale.c glibc-2.27/locale/programs/locale.c
---- glibc-2.27-orig/locale/programs/locale.c	2018-02-01 11:17:18.000000000 -0500
-+++ glibc-2.27/locale/programs/locale.c	2018-02-17 22:36:39.726293213 -0500
-@@ -633,6 +633,24 @@
- 
- 
- static int
-+open_locale_archive (void)
-+{
-+  int fd = -1;
-+  char *versioned_path = getenv ("LOCALE_ARCHIVE_2_27");
-+  char *path = getenv ("LOCALE_ARCHIVE");
-+  if (versioned_path)
-+    fd = open64 (versioned_path, O_RDONLY);
-+  if (path && fd < 0)
-+    fd = open64 (path, O_RDONLY);
-+  if (fd < 0)
-+    fd = open64 (ARCHIVE_NAME, O_RDONLY);
-+  if (fd < 0)
-+    fd = open64 ("/usr/lib/locale/locale-archive", O_RDONLY);
-+  return fd;
-+}
-+
-+
-+static int
- write_archive_locales (void **all_datap, char *linebuf)
- {
-   struct stat64 st;
-@@ -644,7 +662,7 @@
-   int fd, ret = 0;
-   uint32_t cnt;
- 
--  fd = open64 (ARCHIVE_NAME, O_RDONLY);
-+  fd = open_locale_archive ();
-   if (fd < 0)
-     return 0;
- 
-diff -Naur glibc-2.27-orig/locale/programs/locarchive.c glibc-2.27/locale/programs/locarchive.c
---- glibc-2.27-orig/locale/programs/locarchive.c	2018-02-01 11:17:18.000000000 -0500
-+++ glibc-2.27/locale/programs/locarchive.c	2018-02-17 22:40:51.245293975 -0500
-@@ -117,6 +117,22 @@
- }
- 
- 
-+static int
-+open_locale_archive (const char * archivefname, int flags)
-+{
-+  int fd = -1;
-+  char *versioned_path = getenv ("LOCALE_ARCHIVE_2_27");
-+  char *path = getenv ("LOCALE_ARCHIVE");
-+  if (versioned_path)
-+    fd = open64 (versioned_path, flags);
-+  if (path && fd < 0)
-+    fd = open64 (path, flags);
-+  if (fd < 0)
-+    fd = open64 (archivefname, flags);
-+  return fd;
-+}
-+
-+
- static void
- create_archive (const char *archivefname, struct locarhandle *ah)
- {
-@@ -578,7 +594,7 @@
-   while (1)
-     {
-       /* Open the archive.  We must have exclusive write access.  */
--      fd = open64 (archivefname, readonly ? O_RDONLY : O_RDWR);
-+      fd = open_locale_archive (archivefname, readonly ? O_RDONLY : O_RDWR);
-       if (fd == -1)
- 	{
- 	  /* Maybe the file does not yet exist? If we are opening
diff --git a/pkgs/development/libraries/glibc/nix-locale-archive.patch b/pkgs/development/libraries/glibc/nix-locale-archive.patch
index eeaf21901a3..39312951fcf 100644
--- a/pkgs/development/libraries/glibc/nix-locale-archive.patch
+++ b/pkgs/development/libraries/glibc/nix-locale-archive.patch
@@ -1,114 +1,118 @@
-diff -ru glibc-2.16.0-orig/locale/loadarchive.c glibc-2.16.0/locale/loadarchive.c
---- glibc-2.16.0-orig/locale/loadarchive.c	2012-06-30 15:12:34.000000000 -0400
-+++ glibc-2.16.0/locale/loadarchive.c	2012-09-18 11:57:57.277515212 -0400
-@@ -123,6 +123,25 @@
+diff -Naur glibc-2.27-orig/locale/loadarchive.c glibc-2.27/locale/loadarchive.c
+--- glibc-2.27-orig/locale/loadarchive.c	2018-02-01 11:17:18.000000000 -0500
++++ glibc-2.27/locale/loadarchive.c	2018-02-17 22:32:25.680169462 -0500
+@@ -123,6 +123,23 @@
+   return MAX (namehash_end, MAX (string_end, locrectab_end));
  }
  
- 
 +static int
 +open_locale_archive (void)
 +{
 +  int fd = -1;
-+  char *path = getenv ("LOCALE_ARCHIVE_2_11");
-+  char *path2 = getenv ("LOCALE_ARCHIVE");
-+  const char *usualpath = "/usr/lib/locale/locale-archive";
-+  if (path)
-+    fd = open_not_cancel_2 (path, O_RDONLY|O_LARGEFILE|O_CLOEXEC);
-+  if (path2 && fd < 0)
-+    fd = open_not_cancel_2 (path2, O_RDONLY|O_LARGEFILE|O_CLOEXEC);
++  char *versioned_path = getenv ("LOCALE_ARCHIVE_2_27");
++  char *path = getenv ("LOCALE_ARCHIVE");
++  if (versioned_path)
++    fd = __open_nocancel (versioned_path, O_RDONLY|O_LARGEFILE|O_CLOEXEC);
++  if (path && fd < 0)
++    fd = __open_nocancel (path, O_RDONLY|O_LARGEFILE|O_CLOEXEC);
 +  if (fd < 0)
-+    fd = open_not_cancel_2 (archfname, O_RDONLY|O_LARGEFILE|O_CLOEXEC);
++    fd = __open_nocancel (archfname, O_RDONLY|O_LARGEFILE|O_CLOEXEC);
 +  if (fd < 0)
-+    fd = open_not_cancel_2 (usualpath, O_RDONLY|O_LARGEFILE|O_CLOEXEC);
++    fd = __open_nocancel ("/usr/lib/locale/locale-archive", O_RDONLY|O_LARGEFILE|O_CLOEXEC);
 +  return fd;
 +}
 +
-+
+ 
  /* Find the locale *NAMEP in the locale archive, and return the
     internalized data structure for its CATEGORY data.  If this locale has
-    already been loaded from the archive, just returns the existing data
-@@ -202,7 +221,7 @@
+@@ -202,7 +219,7 @@
        archmapped = &headmap;
  
        /* The archive has never been opened.  */
--      fd = open_not_cancel_2 (archfname, O_RDONLY|O_LARGEFILE|O_CLOEXEC);
+-      fd = __open_nocancel (archfname, O_RDONLY|O_LARGEFILE|O_CLOEXEC);
 +      fd = open_locale_archive ();
        if (fd < 0)
  	/* Cannot open the archive, for whatever reason.  */
  	return NULL;
-@@ -393,8 +412,7 @@
+@@ -397,8 +414,7 @@
  	  if (fd == -1)
  	    {
  	      struct stat64 st;
--	      fd = open_not_cancel_2 (archfname,
--				      O_RDONLY|O_LARGEFILE|O_CLOEXEC);
+-	      fd = __open_nocancel (archfname,
+-				    O_RDONLY|O_LARGEFILE|O_CLOEXEC);
 +	      fd = open_locale_archive ();
  	      if (fd == -1)
  		/* Cannot open the archive, for whatever reason.  */
  		return NULL;
-diff -ru glibc-2.16.0-orig/locale/programs/locale.c glibc-2.16.0/locale/programs/locale.c
---- glibc-2.16.0-orig/locale/programs/locale.c	2012-06-30 15:12:34.000000000 -0400
-+++ glibc-2.16.0/locale/programs/locale.c	2012-09-18 11:53:03.719920947 -0400
-@@ -628,6 +628,20 @@
- 		  ((const struct nameent *) b)->name);
- }
+diff -Naur glibc-2.27-orig/locale/programs/locale.c glibc-2.27/locale/programs/locale.c
+--- glibc-2.27-orig/locale/programs/locale.c	2018-02-01 11:17:18.000000000 -0500
++++ glibc-2.27/locale/programs/locale.c	2018-02-17 22:36:39.726293213 -0500
+@@ -633,6 +633,24 @@
  
-+static int
-+open_nix_locale_archive (const char * fname, int access)
-+{
-+  int fd = -1;
-+  char *path = getenv ("LOCALE_ARCHIVE_2_11");
-+  char *path2 = getenv ("LOCALE_ARCHIVE");
-+  if (path)
-+    fd = open64 (path, access);
-+  if (path2 && fd < 0)
-+    fd = open64 (path2, access);
-+  if (fd < 0)
-+    fd = open64 (fname, access);
-+  return fd;
-+}
  
  static int
++open_locale_archive (void)
++{
++  int fd = -1;
++  char *versioned_path = getenv ("LOCALE_ARCHIVE_2_27");
++  char *path = getenv ("LOCALE_ARCHIVE");
++  if (versioned_path)
++    fd = open64 (versioned_path, O_RDONLY);
++  if (path && fd < 0)
++    fd = open64 (path, O_RDONLY);
++  if (fd < 0)
++    fd = open64 (ARCHIVE_NAME, O_RDONLY);
++  if (fd < 0)
++    fd = open64 ("/usr/lib/locale/locale-archive", O_RDONLY);
++  return fd;
++}
++
++
++static int
  write_archive_locales (void **all_datap, char *linebuf)
-@@ -641,7 +655,7 @@
+ {
+   struct stat64 st;
+@@ -644,7 +662,7 @@
    int fd, ret = 0;
    uint32_t cnt;
  
 -  fd = open64 (ARCHIVE_NAME, O_RDONLY);
-+  fd = open_nix_locale_archive (ARCHIVE_NAME, O_RDONLY);
++  fd = open_locale_archive ();
    if (fd < 0)
      return 0;
  
-diff -ru glibc-2.16.0-orig/locale/programs/locarchive.c glibc-2.16.0/locale/programs/locarchive.c
---- glibc-2.16.0-orig/locale/programs/locarchive.c	2012-06-30 15:12:34.000000000 -0400
-+++ glibc-2.16.0/locale/programs/locarchive.c	2012-09-18 11:53:03.720920942 -0400
-@@ -509,6 +509,20 @@
-   *ah = new_ah;
+diff -Naur glibc-2.27-orig/locale/programs/locarchive.c glibc-2.27/locale/programs/locarchive.c
+--- glibc-2.27-orig/locale/programs/locarchive.c	2018-02-01 11:17:18.000000000 -0500
++++ glibc-2.27/locale/programs/locarchive.c	2018-02-17 22:40:51.245293975 -0500
+@@ -117,6 +117,22 @@
  }
  
+ 
 +static int
-+open_nix_locale_archive (const char * fname, int access)
++open_locale_archive (const char * archivefname, int flags)
 +{
 +  int fd = -1;
-+  char *path = getenv ("LOCALE_ARCHIVE_2_11");
-+  char *path2 = getenv ("LOCALE_ARCHIVE");
-+  if (path)
-+    fd = open64 (path, access);
-+  if (path2 && fd < 0)
-+    fd = open64 (path2, access);
++  char *versioned_path = getenv ("LOCALE_ARCHIVE_2_27");
++  char *path = getenv ("LOCALE_ARCHIVE");
++  if (versioned_path)
++    fd = open64 (versioned_path, flags);
++  if (path && fd < 0)
++    fd = open64 (path, flags);
 +  if (fd < 0)
-+    fd = open64 (fname, access);
++    fd = open64 (archivefname, flags);
 +  return fd;
 +}
- 
- void
- open_archive (struct locarhandle *ah, bool readonly)
-@@ -528,7 +542,7 @@
++
++
+ static void
+ create_archive (const char *archivefname, struct locarhandle *ah)
+ {
+@@ -578,7 +594,7 @@
    while (1)
      {
        /* Open the archive.  We must have exclusive write access.  */
 -      fd = open64 (archivefname, readonly ? O_RDONLY : O_RDWR);
-+      fd = open_nix_locale_archive (archivefname, readonly ? O_RDONLY : O_RDWR);
++      fd = open_locale_archive (archivefname, readonly ? O_RDONLY : O_RDWR);
        if (fd == -1)
  	{
- 	  /* Maybe the file does not yet exist.  */
+ 	  /* Maybe the file does not yet exist? If we are opening
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 35fc1e7c019..31800d78bb0 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -8883,13 +8883,9 @@ with pkgs;
   glfw2 = callPackage ../development/libraries/glfw/2.x.nix { };
   glfw3 = callPackage ../development/libraries/glfw/3.x.nix { };
 
-  glibc_2_26 = callPackage ../development/libraries/glibc {
+  glibc = callPackage ../development/libraries/glibc {
     installLocales = config.glibc.locales or false;
   };
-  glibc_2_27 = callPackage ../development/libraries/glibc/2.27.nix {
-    installLocales = config.glibc.locales or false;
-  };
-  glibc = if hostPlatform.isRiscV then glibc_2_27 else glibc_2_26;
 
   glibc_memusage = callPackage ../development/libraries/glibc {
     installLocales = false;
@@ -8897,11 +8893,7 @@ with pkgs;
   };
 
   # Being redundant to avoid cycles on boot. TODO: find a better way
-  glibcCross = let
-    expr = if hostPlatform.isRiscV
-             then ../development/libraries/glibc/2.27.nix
-           else ../development/libraries/glibc;
-  in callPackage expr {
+  glibcCross = callPackage ../development/libraries/glibc {
     installLocales = config.glibc.locales or false;
     stdenv = crossLibcStdenv;
   };