diff --git a/srcpkgs/flex/patches/078b46c6.patch b/srcpkgs/flex/patches/078b46c6.patch
new file mode 100644
index 00000000000..014daabc297
--- /dev/null
+++ b/srcpkgs/flex/patches/078b46c6.patch
@@ -0,0 +1,82 @@
+From 078b46c69d063aef1715b11348a2871d6036f253 Mon Sep 17 00:00:00 2001
+From: Christos Zoulas <christos@zoulas.com>
+Date: Sun, 22 Jan 2017 18:34:30 +0100
+Subject: [PATCH] Add more defines in the non-reentrant part.
+
+Fix the reentrant part; don't "#define yyfoo yyfoo" because it breaks
+code that does #ifndef yywrap ..
+---
+ src/flex.skl | 16 ++++++++++++++--
+ 1 file changed, 14 insertions(+), 2 deletions(-)
+
+diff --git a/src/flex.skl b/src/flex.skl
+index 190700f..6a7cde4 100644
+--- src/flex.skl
++++ src/flex.skl
+@@ -61,11 +61,17 @@ m4_changequote([[, ]])
+ m4_ifelse(M4_YY_PREFIX,yy,,
+ #define yy_create_buffer M4_YY_PREFIX[[_create_buffer]]
+ #define yy_delete_buffer M4_YY_PREFIX[[_delete_buffer]]
+-#define yy_flex_debug M4_YY_PREFIX[[_flex_debug]]
++#define yy_scan_buffer M4_YY_PREFIX[[_scan_buffer]]
++#define yy_scan_string M4_YY_PREFIX[[_scan_string]]
++#define yy_scan_bytes M4_YY_PREFIX[[_scan_bytes]]
+ #define yy_init_buffer M4_YY_PREFIX[[_init_buffer]]
+ #define yy_flush_buffer M4_YY_PREFIX[[_flush_buffer]]
+ #define yy_load_buffer_state M4_YY_PREFIX[[_load_buffer_state]]
+ #define yy_switch_to_buffer M4_YY_PREFIX[[_switch_to_buffer]]
++#define yypush_buffer_state M4_YY_PREFIX[[push_buffer_state]]
++#define yypop_buffer_state M4_YY_PREFIX[[pop_buffer_state]]
++#define yyensure_buffer_stack M4_YY_PREFIX[[ensure_buffer_stack]]
++#define yy_flex_debug M4_YY_PREFIX[[_flex_debug]]
+ #define yyin M4_YY_PREFIX[[in]]
+ #define yyleng M4_YY_PREFIX[[leng]]
+ #define yylex M4_YY_PREFIX[[lex]]
+@@ -107,7 +113,7 @@ m4_ifdef( [[M4_YY_PREFIX]],, [[m4_define([[M4_YY_PREFIX]], [[yy]])]])
+ 
+ m4preproc_define(`M4_GEN_PREFIX',
+     ``[[#define yy$1 ]]M4_YY_PREFIX[[$1]]
+-m4_define([[yy$1]], [[M4_YY_PREFIX[[$1]]m4_ifelse($'`#,0,,[[($'`@)]])]])'')
++%# m4_define([[yy$1]], [[M4_YY_PREFIX[[$1]]m4_ifelse($'`#,0,,[[($'`@)]])]])'')
+ 
+ %if-c++-only
+     /* The c++ scanner is a mess. The FlexLexer.h header file relies on the
+@@ -120,6 +126,7 @@ m4_define([[yy$1]], [[M4_YY_PREFIX[[$1]]m4_ifelse($'`#,0,,[[($'`@)]])]])'')
+ %endif
+ 
+ %if-c-only
++m4_ifelse(M4_YY_PREFIX,yy,,
+     M4_GEN_PREFIX(`_create_buffer')
+     M4_GEN_PREFIX(`_delete_buffer')
+     M4_GEN_PREFIX(`_scan_buffer')
+@@ -155,6 +162,7 @@ m4_define([[yy$1]], [[M4_YY_PREFIX[[$1]]m4_ifelse($'`#,0,,[[($'`@)]])]])'')
+         M4_GEN_PREFIX(`set_column')
+     ]])
+     M4_GEN_PREFIX(`wrap')
++)
+ %endif
+ 
+ m4_ifdef( [[M4_YY_BISON_LVAL]],
+@@ -170,11 +178,14 @@ m4_ifdef( [[<M4_YY_BISON_LLOC>]],
+ ]])
+ 
+ 
++m4_ifelse(M4_YY_PREFIX,yy,,
+     M4_GEN_PREFIX(`alloc')
+     M4_GEN_PREFIX(`realloc')
+     M4_GEN_PREFIX(`free')
++)
+ 
+ %if-c-only
++m4_ifelse(M4_YY_PREFIX,yy,,
+ m4_ifdef( [[M4_YY_NOT_REENTRANT]],
+ [[
+     M4_GEN_PREFIX(`text')
+@@ -184,6 +195,7 @@ m4_ifdef( [[M4_YY_NOT_REENTRANT]],
+     M4_GEN_PREFIX(`_flex_debug')
+     M4_GEN_PREFIX(`lineno')
+ ]])
++)
+ %endif
+ 
+ 
diff --git a/srcpkgs/flex/patches/no-help2man.patch b/srcpkgs/flex/patches/no-help2man.patch
new file mode 100644
index 00000000000..e5cfc88c103
--- /dev/null
+++ b/srcpkgs/flex/patches/no-help2man.patch
@@ -0,0 +1,32 @@
+--- doc/Makefile.in.orig	2017-02-08 15:54:38.164525908 +0100
++++ doc/Makefile.in	2017-02-08 15:57:04.101172972 +0100
+@@ -235,7 +235,6 @@ GETTEXT_MACRO_VERSION = @GETTEXT_MACRO_V
+ GMSGFMT = @GMSGFMT@
+ GMSGFMT_015 = @GMSGFMT_015@
+ GREP = @GREP@
+-HELP2MAN = @HELP2MAN@
+ INDENT = @INDENT@
+ INSTALL = @INSTALL@
+ INSTALL_DATA = @INSTALL_DATA@
+@@ -351,7 +350,6 @@ target_alias = @target_alias@
+ top_build_prefix = @top_build_prefix@
+ top_builddir = @top_builddir@
+ top_srcdir = @top_srcdir@
+-help2man = @HELP2MAN@
+ FLEX = $(top_builddir)/src/flex$(EXEEXT)
+ info_TEXINFOS = flex.texi
+ dist_man_MANS = flex.1
+@@ -880,11 +878,8 @@ uninstall-man: uninstall-man1
+ .PRECIOUS: Makefile
+ 
+ 
+-flex.1: $(top_srcdir)/configure.ac $(top_srcdir)/src/flex.skl $(top_srcdir)/src/options.c $(top_srcdir)/src/options.h | $(FLEX)
+-	$(help2man) --name='$(PACKAGE_NAME)' --section=1 \
+-	--source='The Flex Project' --manual='Programming' \
+-	--output=$@ $(FLEX) \
+-	|| rm -f $@
++flex.1:
++	$(INSTALL) -Dm644 doc/flex.1 $(DESTDIR)/usr/share/man/man1/flex.1
+ 
+ # Tell versions [3.59,3.63) of GNU make to not export all variables.
+ # Otherwise a system limit (for SysV at least) may be exceeded.
diff --git a/srcpkgs/flex/template b/srcpkgs/flex/template
index 1fccee2a6c3..6689e2fe2ad 100644
--- a/srcpkgs/flex/template
+++ b/srcpkgs/flex/template
@@ -1,7 +1,7 @@
 # Template file for 'flex'
 pkgname=flex
 version=2.6.3
-revision=1
+revision=2
 build_style=gnu-configure
 configure_args="--disable-bootstrap --disable-shared"
 hostmakedepends="bison"