diff --git a/pkgs/tools/text/sgml/opensp/default.nix b/pkgs/tools/text/sgml/opensp/default.nix
index 27fa7bb91a8..8d659713d95 100644
--- a/pkgs/tools/text/sgml/opensp/default.nix
+++ b/pkgs/tools/text/sgml/opensp/default.nix
@@ -1,4 +1,5 @@
-{ lib, stdenv, fetchurl, xmlto, docbook_xml_dtd_412, libxslt, docbook_xsl, autoconf, automake, gettext, libiconv, libtool}:
+{ lib, stdenv, fetchurl, fetchpatch, xmlto, docbook_xml_dtd_412
+, libxslt, docbook_xsl, autoconf, automake, gettext, libiconv, libtool}:
 
 stdenv.mkDerivation {
   name = "opensp-1.5.2";
@@ -8,16 +9,18 @@ stdenv.mkDerivation {
     sha256 = "1khpasr6l0a8nfz6kcf3s81vgdab8fm2dj291n5r2s53k228kx2p";
   };
 
-  patchPhase = ''
+  postPatch = ''
     sed -i s,/usr/share/sgml/docbook/xml-dtd-4.1.2/,${docbook_xml_dtd_412}/xml/dtd/docbook/, \
       docsrc/*.xml
   '';
 
-  configureFlags = lib.optional stdenv.isDarwin [
-    "--with-libintl-prefix=/usr"
-    "--with-libiconv-prefix=/usr"
+  patches = [
+    (fetchpatch {
+      url = "https://gitweb.gentoo.org/repo/gentoo.git/plain/app-text/opensp/files/opensp-1.5.2-c11-using.patch?id=688d9675782dfc162d4e6cff04c668f7516118d0";
+      sha256 = "04q14s8qsad0bkjmj067dn831i0r6v7742rafdlnbfm5y249m2q6";
+    })
   ];
-
+  
   setupHook = ./setup-hook.sh;
 
   postFixup = ''
@@ -29,8 +32,9 @@ stdenv.mkDerivation {
   preConfigure = if stdenv.isCygwin then "autoreconf -fi" else null;
 
   # need autoconf, automake, gettext, and libtool for reconfigure
-  buildInputs = stdenv.lib.optionals stdenv.isCygwin [ autoconf automake gettext libiconv libtool ]
-    ++ [ xmlto docbook_xml_dtd_412 libxslt docbook_xsl ];
+  nativeBuildInputs = stdenv.lib.optionals stdenv.isCygwin [ autoconf automake libtool ];
+
+  buildInputs = [ xmlto docbook_xml_dtd_412 libxslt docbook_xsl gettext libiconv ];
 
   doCheck = false; # fails