diff --git a/pkgs/development/libraries/ldb/default.nix b/pkgs/development/libraries/ldb/default.nix
index 37856f5a0130..bdd630103e37 100644
--- a/pkgs/development/libraries/ldb/default.nix
+++ b/pkgs/development/libraries/ldb/default.nix
@@ -12,6 +12,7 @@
 , docbook_xml_dtd_42
 , cmocka
 , wafHook
+, libxcrypt
 }:
 
 stdenv.mkDerivation rec {
@@ -32,6 +33,8 @@ stdenv.mkDerivation rec {
     libxslt
     docbook-xsl-nons
     docbook_xml_dtd_42
+    tdb
+    tevent
   ];
 
   buildInputs = [
@@ -42,6 +45,7 @@ stdenv.mkDerivation rec {
     tevent
     popt
     cmocka
+    libxcrypt
   ];
 
   # otherwise the configure script fails with
diff --git a/pkgs/development/libraries/tevent/default.nix b/pkgs/development/libraries/tevent/default.nix
index f10235650c4a..7b798d00b01e 100644
--- a/pkgs/development/libraries/tevent/default.nix
+++ b/pkgs/development/libraries/tevent/default.nix
@@ -10,6 +10,7 @@
 , docbook_xml_dtd_42
 , which
 , wafHook
+, libxcrypt
 }:
 
 stdenv.mkDerivation rec {
@@ -36,6 +37,7 @@ stdenv.mkDerivation rec {
     cmocka
     readline # required to build python
     talloc
+    libxcrypt
   ];
 
   # otherwise the configure script fails with
@@ -52,6 +54,11 @@ stdenv.mkDerivation rec {
     "--builtin-libraries=replace"
   ];
 
+  # python-config from build Python gives incorrect values when cross-compiling.
+  # If python-config is not found, the build falls back to using the sysconfig
+  # module, which works correctly in all cases.
+  PYTHON_CONFIG = "/invalid";
+
   meta = with lib; {
     description = "An event system based on the talloc memory management library";
     homepage = "https://tevent.samba.org/";