diff --git a/erlang.spec b/erlang.spec
index c1223da..eff8714 100644
--- a/erlang.spec
+++ b/erlang.spec
@@ -10,7 +10,7 @@
 
 Name:		erlang
 Version:	17.3.4
-Release:	1%{?dist}
+Release:	2%{?dist}
 Summary:	General-purpose programming language and runtime environment
 
 Group:		Development/Languages
@@ -71,6 +71,9 @@ Patch9: otp-0009-Expose-NIF-version.patch
 # Fedora specific patch
 #   Split off webtool dependency from tools
 Patch10: otp-0010-Split-off-webtool-dependency-from-tools.patch
+# Fedora specific patch
+#   Introduce os:getenv/2
+Patch11: otp-0011-Introduce-os-getenv-2.patch
 # end of autogenerated patch tag list
 
 BuildRequires:	lksctp-tools-devel
@@ -900,6 +903,7 @@ Erlang mode for XEmacs (source lisp files).
 %patch8 -p1 -b .Install_internal_hrl_files_when_necessary
 %patch9 -p1 -b .Expose_NIF_version
 %patch10 -p1 -b .Split_off_webtool_dependency_from_tools
+%patch11 -p1 -b .Introduce_os_getenv_2
 # end of autogenerated prep patch list
 
 # FIXME we should come up with a better solution
@@ -2220,6 +2224,9 @@ useradd -r -g epmd -d /tmp -s /sbin/nologin \
 
 
 %changelog
+* Mon Dec 01 2014 Peter Lemenkov <lemenkov@gmail.com> - 17.3.4-2
+- Backport useful os:getenv/2 from master (see https://github.com/erlang/otp/pull/535 )
+
 * Sat Nov 08 2014 Peter Lemenkov <lemenkov@gmail.com> - 17.3.4-1
 - Ver. 17.3.4 (API/ABI compatible release)
 - Relax an erlang-tools dependency on erlang-webtool down to Suggests
diff --git a/otp-0011-Introduce-os-getenv-2.patch b/otp-0011-Introduce-os-getenv-2.patch
new file mode 100644
index 0000000..6c48db2
--- /dev/null
+++ b/otp-0011-Introduce-os-getenv-2.patch
@@ -0,0 +1,63 @@
+From: Peter Lemenkov <lemenkov@gmail.com>
+Date: Sat, 8 Nov 2014 15:11:04 +0300
+Subject: [PATCH] Introduce os:getenv/2
+
+Signed-off-by: Peter Lemenkov <lemenkov@gmail.com>
+
+diff --git a/lib/kernel/doc/src/os.xml b/lib/kernel/doc/src/os.xml
+index 2b57e75..8b85f24 100644
+--- a/lib/kernel/doc/src/os.xml
++++ b/lib/kernel/doc/src/os.xml
+@@ -100,6 +100,19 @@ DirOut = os:cmd("dir"), % on Win32 platform</code>
+       </desc>
+     </func>
+     <func>
++      <name name="getenv" arity="2"/>
++      <fsummary>Get the value of an environment variable</fsummary>
++      <desc>
++        <p>Returns the <c><anno>Value</anno></c> of the environment variable
++          <c><anno>VarName</anno></c>, or <c>DefaultValue</c> if the environment variable
++          is undefined.</p>
++	<p>If Unicode file name encoding is in effect (see the <seealso
++	marker="erts:erl#file_name_encoding">erl manual
++	page</seealso>), the strings (both <c><anno>VarName</anno></c> and
++	<c><anno>Value</anno></c>) may contain characters with codepoints > 255.</p>
++      </desc>
++    </func>
++    <func>
+       <name name="getpid" arity="0"/>
+       <fsummary>Return the process identifier of the emulator process</fsummary>
+       <desc>
+diff --git a/lib/kernel/src/os.erl b/lib/kernel/src/os.erl
+index 187fd00..8aaf13b 100644
+--- a/lib/kernel/src/os.erl
++++ b/lib/kernel/src/os.erl
+@@ -26,7 +26,7 @@
+ 
+ %%% BIFs
+ 
+--export([getenv/0, getenv/1, getpid/0, putenv/2, timestamp/0, unsetenv/1]).
++-export([getenv/0, getenv/1, getenv/2, getpid/0, putenv/2, timestamp/0, unsetenv/1]).
+ 
+ -spec getenv() -> [string()].
+ 
+@@ -39,6 +39,19 @@ getenv() -> erlang:nif_error(undef).
+ getenv(_) ->
+     erlang:nif_error(undef).
+ 
++-spec getenv(VarName, DefaultValue) -> Value when
++      VarName :: string(),
++      DefaultValue :: string(),
++      Value :: string().
++
++getenv(VarName, DefaultValue) ->
++    case os:getenv(VarName) of
++        false ->
++           DefaultValue;
++        Value ->
++            Value
++    end.
++
+ -spec getpid() -> Value when
+       Value :: string().
+