diff --git a/pkgs/development/compilers/llvm/15/compiler-rt/default.nix b/pkgs/development/compilers/llvm/15/compiler-rt/default.nix
index 3c335345f623f..6f20d23b32bc1 100644
--- a/pkgs/development/compilers/llvm/15/compiler-rt/default.nix
+++ b/pkgs/development/compilers/llvm/15/compiler-rt/default.nix
@@ -151,5 +151,8 @@ stdenv.mkDerivation {
       implementations of run-time libraries for dynamic testing tools such as
       AddressSanitizer, ThreadSanitizer, MemorySanitizer, and DataFlowSanitizer.
     '';
+    # "All of the code in the compiler-rt project is dual licensed under the MIT
+    # license and the UIUC License (a BSD-like license)":
+    license = with lib.licenses; [ mit ncsa ];
   };
 }
diff --git a/pkgs/development/compilers/llvm/15/default.nix b/pkgs/development/compilers/llvm/15/default.nix
index 526e79992b886..0cef33ea61cc9 100644
--- a/pkgs/development/compilers/llvm/15/default.nix
+++ b/pkgs/development/compilers/llvm/15/default.nix
@@ -84,7 +84,7 @@ in let
   inherit (releaseInfo) release_version version;
 
   llvm_meta = {
-    license     = with lib.licenses; [ ncsa asl20-llvm ];
+    license     = lib.licenses.ncsa;
     maintainers = lib.teams.llvm.members;
     platforms   = lib.platforms.all;
   };
diff --git a/pkgs/development/compilers/llvm/15/libcxx/default.nix b/pkgs/development/compilers/llvm/15/libcxx/default.nix
index 7762df29386ef..94374c8a312df 100644
--- a/pkgs/development/compilers/llvm/15/libcxx/default.nix
+++ b/pkgs/development/compilers/llvm/15/libcxx/default.nix
@@ -103,5 +103,8 @@ stdenv.mkDerivation rec {
       libc++ is an implementation of the C++ standard library, targeting C++11,
       C++14 and above.
     '';
+    # "All of the code in libc++ is dual licensed under the MIT license and the
+    # UIUC License (a BSD-like license)":
+    license = with lib.licenses; [ mit ncsa ];
   };
 }
diff --git a/pkgs/development/compilers/llvm/15/libcxxabi/default.nix b/pkgs/development/compilers/llvm/15/libcxxabi/default.nix
index fd99f4553c0cc..cb5fa44f07009 100644
--- a/pkgs/development/compilers/llvm/15/libcxxabi/default.nix
+++ b/pkgs/development/compilers/llvm/15/libcxxabi/default.nix
@@ -100,6 +100,9 @@ stdenv.mkDerivation rec {
     longDescription = ''
       libc++abi is a new implementation of low level support for a standard C++ library.
     '';
+    # "All of the code in libc++abi is dual licensed under the MIT license and
+    # the UIUC License (a BSD-like license)":
+    license = with lib.licenses; [ mit ncsa ];
     maintainers = llvm_meta.maintainers ++ [ lib.maintainers.vlstill ];
   };
 }
diff --git a/pkgs/development/compilers/llvm/15/openmp/default.nix b/pkgs/development/compilers/llvm/15/openmp/default.nix
index 8047cb1122dee..d51335436ad23 100644
--- a/pkgs/development/compilers/llvm/15/openmp/default.nix
+++ b/pkgs/development/compilers/llvm/15/openmp/default.nix
@@ -67,5 +67,8 @@ stdenv.mkDerivation rec {
       "clang -fopenmp" must be linked before it can run and the library that
       supports offload to target devices.
     '';
+    # "All of the code is dual licensed under the MIT license and the UIUC
+    # License (a BSD-like license)":
+    license = with lib.licenses; [ mit ncsa ];
   };
 }