diff --git a/pkgs/development/compilers/llvm/3.7/libc++abi.nix b/pkgs/development/compilers/llvm/3.7/libc++abi.nix
index 97f182a9af81..a495e1860ad2 100644
--- a/pkgs/development/compilers/llvm/3.7/libc++abi.nix
+++ b/pkgs/development/compilers/llvm/3.7/libc++abi.nix
@@ -5,7 +5,7 @@ stdenv.mkDerivation {
 
   src = fetch "libcxxabi" "1swvnhrf9g67579c5picg0l869f8l2bwi4xqpbcb4n296gyp9c28";
 
-  buildInputs = [ cmake ] ++ stdenv.lib.optional (!stdenv.isDarwin) libunwind;
+  buildInputs = [ cmake ] ++ stdenv.lib.optional (!stdenv.isDarwin && !stdenv.isFreeBSD) libunwind;
 
   postUnpack = ''
     unpackFile ${libcxx.src}
diff --git a/pkgs/development/libraries/libtiff/default.nix b/pkgs/development/libraries/libtiff/default.nix
index 2c559d221abe..7e9c11d700a5 100644
--- a/pkgs/development/libraries/libtiff/default.nix
+++ b/pkgs/development/libraries/libtiff/default.nix
@@ -22,7 +22,7 @@ stdenv.mkDerivation rec {
 
   enableParallelBuilding = true;
 
-  doCheck = true;
+  doCheck = !stdenv.isFreeBSD;
 
   meta = with stdenv.lib; {
     description = "Library and utilities for working with the TIFF image file format";
diff --git a/pkgs/development/libraries/zlib/default.nix b/pkgs/development/libraries/zlib/default.nix
index 93474d14344e..99be5162010d 100644
--- a/pkgs/development/libraries/zlib/default.nix
+++ b/pkgs/development/libraries/zlib/default.nix
@@ -31,7 +31,7 @@ stdenv.mkDerivation (rec {
 
   # As zlib takes part in the stdenv building, we don't want references
   # to the bootstrap-tools libgcc (as uses to happen on arm/mips)
-  NIX_CFLAGS_COMPILE = stdenv.lib.optionalString (!stdenv.isDarwin) "-static-libgcc";
+  NIX_CFLAGS_COMPILE = stdenv.lib.optionalString (!stdenv.isDarwin) "-static-libgcc " + stdenv.lib.optionalString (stdenv.isFreeBSD) "-fPIC";
 
   crossAttrs = {
     dontStrip = static;
diff --git a/pkgs/stdenv/default.nix b/pkgs/stdenv/default.nix
index da93229ce94c..37e90faf6d0e 100644
--- a/pkgs/stdenv/default.nix
+++ b/pkgs/stdenv/default.nix
@@ -33,6 +33,8 @@ rec {
     pkgs = stdenvNativePkgs;
   };
 
+  stdenvFreeBSD = (import ./freebsd { inherit system allPackages platform config; }).stdenvFreeBSD;
+
   # Linux standard environment.
   stdenvLinux = (import ./linux { inherit system allPackages platform config lib; }).stdenvLinux;
 
@@ -58,5 +60,6 @@ rec {
     if system == "x86_64-solaris" then stdenvNix else
     if system == "i686-cygwin" then stdenvNative else
     if system == "x86_64-cygwin" then stdenvNative else
+    if system == "x86_64-freebsd" then stdenvFreeBSD else
     stdenvNative;
 }
diff --git a/pkgs/stdenv/freebsd/default.nix b/pkgs/stdenv/freebsd/default.nix
new file mode 100644
index 000000000000..de39e79102f9
--- /dev/null
+++ b/pkgs/stdenv/freebsd/default.nix
@@ -0,0 +1,131 @@
+{ system      ? builtins.currentSystem
+, allPackages ? import ../../top-level/all-packages.nix
+, platform    ? null
+, config      ? {}
+}:
+
+rec {
+  allPackages = import ../../top-level/all-packages.nix;
+
+  bootstrapTools = derivation {
+    inherit system;
+
+    name    = "trivial-bootstrap-tools";
+    builder = "/bin/sh";
+    args    = [ ./trivial-bootstrap.sh ];
+
+    mkdir   = "/bin/mkdir";
+    ln      = "/bin/ln";
+  };
+
+  stage0 = rec {
+    fetchurl = import ../../build-support/fetchurl {
+      inherit stdenv;
+      curl = bootstrapTools;
+    };
+
+    stdenv = import ../generic {
+      inherit system config;
+      name         = "stdenv-freebsd-boot-0";
+      shell        = "/usr/local/bin/bash";
+      initialPath  = [ bootstrapTools ];
+      fetchurlBoot = fetchurl;
+      cc           = null;
+    };
+  };
+
+  buildTools = { #import ../../os-specific/freebsd/command-line-tools
+    inherit (stage0) stdenv fetchurl;
+    xar  = bootstrapTools;
+    gzip = bootstrapTools;
+    cpio = bootstrapTools;
+  };
+
+  preHook = ''
+    export NIX_IGNORE_LD_THROUGH_GCC=1
+    export NIX_DONT_SET_RPATH=1
+    export NIX_NO_SELF_RPATH=1
+    dontFixLibtool=1
+    stripAllFlags=" " # the Darwin "strip" command doesn't know "-s"
+    xargsFlags=" "
+  '';
+
+  stage1 = rec {
+    nativePrefix = "/usr";
+
+    stdenv = import ../generic {
+      name = "stdenv-freebsd-boot-1";
+
+      inherit system config;
+      inherit (stage0.stdenv) shell fetchurlBoot;
+
+      initialPath = stage0.stdenv.initialPath ++ [ nativePrefix ];
+
+      preHook = preHook + "\n" + ''
+        export NIX_LDFLAGS_AFTER+=" -L/usr/lib"
+        export NIX_ENFORCE_PURITY=
+        export NIX_CFLAGS_COMPILE+=" -isystem ${nativePrefix}/include/c++/v1"
+        export NIX_CFLAGS_LINK+=" -Wl,-rpath,${nativePrefix}/lib"
+      '';
+
+      cc = import ../../build-support/cc-wrapper {
+        nativeTools  = true;
+        nativePrefix = nativePrefix;
+        nativeLibc   = true;
+        stdenv       = stage0.stdenv;
+        shell        = "/usr/local/bin/bash";
+        cc           = {
+          name    = "clang-9.9.9";
+          cc      = "/usr";
+          outPath = nativePrefix;
+        };
+        isClang      = true;
+      };
+    };
+    pkgs = allPackages {
+      inherit system platform;
+      bootStdenv = stdenv;
+    };
+  };
+
+  stage2 = rec {
+    stdenv = import ../generic {
+      name = "stdenv-freebsd-boot-2";
+
+      inherit system config;
+      inherit (stage1.stdenv) shell fetchurlBoot preHook cc;
+
+      initialPath = [ "/usr/local/bin" ] ++ stage1.stdenv.initialPath;
+    };
+    pkgs = allPackages {
+      inherit system platform;
+      bootStdenv = stdenv;
+    };
+  };
+
+  stage3 = with stage2; import ../generic {
+    name = "stdenv-freebsd-boot-3";
+
+    inherit system config;
+    inherit (stdenv) fetchurlBoot;
+
+    initialPath = [ bootstrapTools ];
+
+    preHook = preHook + "\n" + ''
+      export NIX_ENFORCE_PURITY=1
+    '';
+
+    cc = import ../../build-support/cc-wrapper {
+      inherit stdenv;
+      nativeTools   = true;
+      nativePrefix  = "/usr/local/bin";
+      nativeLibc    = true;
+      cc            = stage2.stdenv.cc; #pkgs.llvmPackages.clang-unwrapped; 
+      isClang       = true;
+    };
+
+    shell = "/usr/local/bin/bash";
+  };
+
+  stdenvFreeBSD = stage3;
+}
diff --git a/pkgs/stdenv/freebsd/trivial-bootstrap.sh b/pkgs/stdenv/freebsd/trivial-bootstrap.sh
new file mode 100644
index 000000000000..f0b861d1a180
--- /dev/null
+++ b/pkgs/stdenv/freebsd/trivial-bootstrap.sh
@@ -0,0 +1,183 @@
+
+# Building bootstrap tools
+echo Building the trivial bootstrap environment...
+
+# needed FreeBSD packages:
+# findutils gcpio gawk gnugrep coreutils bash gsed gtar gmake xar binutils gpatch lbzip2
+
+$mkdir -p $out/bin
+
+$ln -s $ln $out/bin/ln
+
+PATH=$out/bin/
+
+cd $out/bin
+
+ln -s $mkdir
+
+ln -s /usr/local/bin/bash
+ln -s /bin/sh
+
+ln -s /usr/local/bin/gmake make
+
+ln -s /usr/local/bin/lbzip2
+
+ln -s /usr/bin/bzip2
+ln -s /usr/bin/bunzip2
+ln -s /usr/bin/bzcat
+ln -s /usr/bin/bzip2recover
+
+ln -s /usr/bin/xz
+ln -s /usr/bin/unxz
+ln -s /usr/bin/xzcat
+ln -s /usr/bin/lzma
+ln -s /usr/bin/unlzma
+ln -s /usr/bin/lzcat
+
+ln -s /usr/local/bin/gcp cp
+ln -s /usr/local/bin/gdd dd
+ln -s /usr/local/bin/gmv mv
+ln -s /usr/local/bin/grm rm
+ln -s /usr/local/bin/gls ls
+ln -s /bin/ps ps
+ln -s /usr/local/bin/gcat cat
+ln -s /usr/local/bin/gecho echo
+ln -s /usr/local/bin/gexpr expr
+ln -s /usr/local/bin/gtest test
+ln -s /usr/local/bin/gdate date
+ln -s /usr/local/bin/gchmod chmod
+ln -s /usr/local/bin/grmdir rmdir
+ln -s /usr/local/bin/gsleep sleep
+ln -s /bin/hostname hostname
+
+ln -s /usr/local/bin/gid id
+ln -s /usr/local/bin/god od
+ln -s /usr/local/bin/gtr tr
+ln -s /usr/local/bin/gwc wc
+ln -s /usr/local/bin/gcut cut
+ln -s /usr/bin/cmp cmp
+ln -s /usr/local/bin/gsed sed
+ln -s /usr/local/bin/gtar tar
+ln -s /usr/local/bin/xar xar
+ln -s /usr/local/bin/gawk awk
+ln -s /usr/local/bin/genv env
+ln -s /usr/local/bin/gtee tee
+ln -s /usr/local/bin/gcomm comm
+ln -s /usr/local/bin/gcpio cpio
+ln -s /usr/local/bin/curl curl
+ln -s /usr/local/bin/gfind find
+ln -s /usr/local/bin/grep grep #other grep is in /usr/bin
+ln -s /usr/bin/gzip
+ln -s /usr/bin/gunzip
+ln -s /usr/bin/zcat
+ln -s /usr/local/bin/ghead head
+ln -s /usr/bin/tail tail
+ln -s /usr/local/bin/guniq uniq
+ln -s /usr/bin/less less
+ln -s /usr/local/bin/gtrue true
+ln -s /usr/bin/diff diff
+ln -s /usr/local/bin/egrep egrep
+ln -s /usr/local/bin/fgrep fgrep
+ln -s /usr/local/bin/gpatch patch
+ln -s /usr/local/bin/guname uname
+ln -s /usr/local/bin/gtouch touch
+ln -s /usr/local/bin/gsplit split
+ln -s /usr/local/bin/gxargs xargs
+ln -s /usr/bin/which which
+ln -s /usr/local/bin/ginstall install
+ln -s /usr/local/bin/gbasename basename
+ln -s /usr/local/bin/gdirname dirname
+ln -s /usr/local/bin/greadlink readlink
+
+ln -fs /usr/local/bin/gln ln
+ln -s /usr/local/bin/gyes yes
+ln -s /usr/local/bin/gwhoami whoami
+ln -s /usr/local/bin/gvdir vdir
+ln -s /usr/local/bin/gusers users
+ln -s /usr/local/bin/guptime uptime
+ln -s /usr/local/bin/gunlink unlink
+ln -s /usr/local/bin/gtty tty
+ln -s /usr/local/bin/gunexpand unexpand
+ln -s /usr/local/bin/gtsort tsort
+ln -s /usr/local/bin/gtruncate truncate
+ln -s /usr/local/bin/gtimeout timeout
+ln -s /usr/local/bin/gtac tac
+ln -s /usr/local/bin/gsync sync
+ln -s /usr/local/bin/gsum sum
+ln -s /usr/local/bin/gstty stty
+ln -s /usr/local/bin/gstdbuf stdbuf
+ln -s /usr/local/bin/gsort sort
+ln -s /usr/local/bin/gruncon runcon
+ln -s /usr/local/bin/gseq seq
+ln -s /usr/local/bin/gsha1sum sha1sum
+ln -s /usr/local/bin/gsha224sum sha224sum
+ln -s /usr/local/bin/gsha256sum sha256sum
+ln -s /usr/local/bin/gsha384sum sha384sum
+ln -s /usr/local/bin/gsha512sum sha512sum
+ln -s /usr/local/bin/gshred shred
+ln -s /usr/local/bin/gshuf shuf
+ln -s /usr/local/bin/grealpath realpath
+ln -s "/usr/local/bin/g[" "["
+ln -s /usr/local/bin/gbase64 base64
+ln -s /usr/local/bin/gchcon chcon
+ln -s /usr/local/bin/gchgrp chgrp
+ln -s /usr/local/bin/gchown chown
+ln -s /usr/local/bin/gchroot chroot
+ln -s /usr/local/bin/gcksum cksum
+ln -s /usr/local/bin/gcsplit csplit
+ln -s /usr/local/bin/gdf df
+ln -s /usr/local/bin/gdircolors dircolors
+ln -s /usr/local/bin/gdu du
+ln -s /usr/local/bin/gexpand expand
+ln -s /usr/local/bin/gfactor factor
+ln -s /usr/local/bin/gfalse false
+ln -s /usr/local/bin/gfmt fmt
+ln -s /usr/local/bin/gfold fold
+ln -s /usr/local/bin/ggroups groups
+ln -s /usr/local/bin/ghostid hostid
+ln -s /usr/local/bin/gjoin join
+ln -s /usr/local/bin/gkill kill
+ln -s /usr/local/bin/glink link
+ln -s /usr/local/bin/glogname logname
+ln -s /usr/local/bin/gmd5sum md5sum
+ln -s /usr/local/bin/gmkdir mkdir
+ln -s /usr/local/bin/gmkfifo mkfifo
+ln -s /usr/local/bin/gmknod mknod
+ln -s /usr/local/bin/gmktemp mktemp
+ln -s /usr/local/bin/gnice nice
+ln -s /usr/local/bin/gnl nl
+ln -s /usr/local/bin/gnohup nohup
+ln -s /usr/local/bin/gnproc nproc
+ln -s /usr/local/bin/gnumfmt numfmt
+ln -s /usr/local/bin/gnustat nustat
+ln -s /usr/local/bin/gpaste paste
+ln -s /usr/local/bin/gpathchk pathchk
+ln -s /usr/local/bin/gpinky pinky
+ln -s /usr/local/bin/gpr pr
+ln -s /usr/local/bin/gprintenv printenv
+ln -s /usr/local/bin/gprintf printf
+ln -s /usr/local/bin/gptx ptx
+ln -s /usr/local/bin/gpwd pwd
+
+# binutils
+# pkg info -l binutils | grep usr/local/bin
+ln -s /usr/local/bin/addr2line
+ln -s /usr/local/bin/ar
+ln -s /usr/local/bin/as
+ln -s /usr/local/bin/c++filt
+ln -s /usr/local/bin/dwp
+ln -s /usr/local/bin/elfedit
+ln -s /usr/local/bin/gprof
+ln -s /usr/local/bin/ld
+ln -s /usr/local/bin/ld.bfd
+ln -s /usr/local/bin/ld.gold
+ln -s /usr/local/bin/nm
+ln -s /usr/local/bin/objcopy
+ln -s /usr/local/bin/objdump
+ln -s /usr/local/bin/ranlib
+ln -s /usr/local/bin/readelf
+ln -s /usr/local/bin/size
+ln -s /usr/local/bin/strings
+ln -s /usr/local/bin/strip
+
+#pkg info -l llvm37 | grep usr/local/bin
diff --git a/pkgs/stdenv/native/default.nix b/pkgs/stdenv/native/default.nix
index 2a1acba41bb1..93d1c7e971c2 100644
--- a/pkgs/stdenv/native/default.nix
+++ b/pkgs/stdenv/native/default.nix
@@ -27,8 +27,6 @@ rec {
 
     alias patch=gpatch # pcre relied on this for patching binary files
 
-    alias cc=clang37
-
     # we need GNU cp for --reflink, need to alias all of coreutils
     alias basename=gbasename
     alias cat=gcat