diff --git a/pkgs/development/libraries/openldap/default.nix b/pkgs/development/libraries/openldap/default.nix
index 1f7bbb41c36e..551a0827eee2 100644
--- a/pkgs/development/libraries/openldap/default.nix
+++ b/pkgs/development/libraries/openldap/default.nix
@@ -1,6 +1,7 @@
 { lib
 , stdenv
 , fetchurl
+, fetchpatch
 
 # dependencies
 , cyrus_sasl
@@ -21,6 +22,39 @@ stdenv.mkDerivation rec {
     hash = "sha256-gdCTRSMutiSG7PWsrNLFbAxFtKbIwGZhLn9CGiOhz4c";
   };
 
+  patches = [
+    # ITS#9840 - ldif-filter: fix parallel build failure
+    (fetchpatch {
+      url = "https://github.com/openldap/openldap/commit/7d977f51e6dfa570a471d163b9e8255bdd3dc12f.patch";
+      hash = "sha256:1vid6pj2gmqywbghnd380x19ml241ldc1fyslb6br6q27zpgbdlp";
+    })
+    # ITS#9840 - libraries/Makefile.in: ignore the mkdir errors
+    (fetchpatch {
+      url = "https://github.com/openldap/openldap/commit/71f24015c312171c00ce94c9ff9b9c6664bdca8d.patch";
+      hash = "sha256:1a81vv6nkhgiadnj4g1wyzgzdp2zd151h0vkwvv9gzmqvhwcnc04";
+    })
+    # ITS#7165 back-mdb: check for stale readers on
+    (fetchpatch {
+      url = "https://github.com/openldap/openldap/commit/7e7f01c301db454e8c507999c77b55a1d97efc21.patch";
+      hash = "sha256:1fc2yck2gn3zlpfqjdn56ar206npi8cmb8yg5ny4lww0ygmyzdfz";
+    })
+    # ITS#9858 back-mdb: delay indexer task startup
+    (fetchpatch {
+      url = "https://github.com/openldap/openldap/commit/ac061c684cc79d64ab4089fe3020921a0064a307.patch";
+      hash = "sha256:01f0y50zlcj6n5mfkmb0di4p5vrlgn31zccx4a9k5m8vzxaqmw9d";
+    })
+    # ITS#9858 back-mdb: fix index reconfig
+    (fetchpatch {
+      url = "https://github.com/openldap/openldap/commit/c43c7a937cfb3a781f99b458b7ad71eb564a2bc2.patch";
+      hash = "sha256:02yh0c8cyx14iir5qhfam5shrg5d3115s2nv0pmqdj6najrqc5mm";
+    })
+    # ITS#9157: check for NULL ld
+    (fetchpatch {
+      url = "https://github.com/openldap/openldap/commit/6675535cd6ad01f9519ecd5d75061a74bdf095c7.patch";
+      hash = "sha256:0dali5ifcwba8400s065f0fizl9h44i0mzb06qgxhygff6yfrgif";
+    })
+  ];
+
   # TODO: separate "out" and "bin"
   outputs = [
     "out"
@@ -59,7 +93,7 @@ stdenv.mkDerivation rec {
     "ac_cv_func_memcmp_working=yes"
   ] ++ lib.optional stdenv.isFreeBSD "--with-pic";
 
-  makeFlags= [
+  makeFlags = [
     "CC=${stdenv.cc.targetPrefix}cc"
     "STRIP="  # Disable install stripping as it breaks cross-compiling. We strip binaries anyway in fixupPhase.
     "prefix=${placeholder "out"}"
@@ -116,6 +150,6 @@ stdenv.mkDerivation rec {
     description = "An open source implementation of the Lightweight Directory Access Protocol";
     license = licenses.openldap;
     maintainers = with maintainers; [ ajs124 das_j hexa ];
-    platforms   = platforms.unix;
+    platforms = platforms.unix;
   };
 }